11 juil. 2025

Marinade Techniques for Tofu and Tempeh: Complete Guide

Two tablespoons of soy sauce weigh 30 g and deliver 5.58 g of salt, based on the Ciqual 2020 table published by ANSES, which lists 18.6 g of salt per 100 g of soy sauce. The World Health Organization recommends no more than 5 g of salt a day for an adult. A standard marinade for two therefore uses up a full day’s allowance on its own, while the tofu it coats contains 0.025 g of salt per 100 g. That is the real subject of a page about marinades, and almost nobody writes it down.

The other thing nobody writes down: a marinade does not penetrate a block of tofu. It coats it. The first few millimetres take on flavour, the centre stays exactly what it was. Everything below starts from those two facts and follows them through to practical consequences: how much to use, how long to wait, and when waiting longer changes nothing at all.

What a marinated serving actually contains

The four marinades described further down were weighed to the gram and calculated on the Ciqual 2020 table. Each line assumes the whole marinade ends up on the plate, which is what happens when you reduce it in the pan at the end, and which is also the most honest way to count.

Preparation (2 servings)	kcal/serving	Protein	Fat	Sugars	Salt
Tofu 200 g, plain	148	13.4 g	8.5 g	0.6 g	0.03 g
Tofu 200 g + Asian marinade	244	14.7 g	15.1 g	7.2 g	2.82 g
Tofu 200 g + reduced-salt Asian marinade	225	14.0 g	15.1 g	3.4 g	0.96 g
Tempeh 200 g + barbecue marinade	263	16.3 g	9.9 g	13.2 g	0.63 g
Tofu 200 g + coconut curry marinade	253	14.8 g	18.4 g	1.7 g	1.45 g
Tofu 200 g + Mediterranean marinade	287	13.7 g	23.5 g	0.8 g	0.03 g

Three things stand out. The classic Asian marinade takes a serving from 0.03 to 2.82 g of salt, which is 56 % of the WHO daily maximum, almost entirely because of the soy sauce. The Mediterranean marinade, the only one with virtually no salt, is the one that delivers the most fat, 23.5 g per serving, because 30 g of olive oil is 270 kcal on its own. And the barbecue version is the sugary one: 13.2 g of sugars per serving, most of it from the shop-bought sauce, which runs at 27.5 g of sugars per 100 g.

One regulatory detail has practical consequences. Annex 13 of the Swiss ordinance on food information sets the “high in protein” threshold at 20 % of energy value. Plain tofu sits at 36.2 %, tempeh at 41.0 %. Asian-marinated tofu drops to 24.0 %, and the Mediterranean version to 19.0 %. Add three tablespoons of oil to a protein food and you end up with a dish that, formally, is no longer high in protein. Nobody needs to run that calculation at home, but it gives a useful sense of scale: a marinade is not neutral, it shifts the whole profile of the dish.

Why a marinade does not penetrate tofu

A meat marinade works because the fibrous structure gives solutes a route in. Tofu is not fibrous: it is a coagulated soy protein gel loaded with water, roughly 73.8 g per 100 g according to Ciqual. Salt and aroma compounds move through it only by diffusion, a slow process governed by Fick’s second law.

A 2026 study on a model cheese system measured that diffusion in a protein gel and identified what speeds it up: the calcium content of the gel, which significantly increases salt penetration between 0 and 1 % by weight, and the salting temperature, more effective at 30 °C than at 20 or 40 °C. Tofu happens to be a calcium gel when it is set with calcium sulphate. That is interesting, but neither variable is adjustable in a home kitchen: the coagulant is the manufacturer’s decision, and marinating at 30 °C is out of the question for hygiene reasons.

That leaves the one variable you own: thickness. Diffusion distance enters the equations squared, which means a piece half as thick does not take half the time but roughly a quarter. Going from 2 cm slices to 1 cm slices changes the result more than doubling the resting time. It is also why an overnight marinade on a whole block gives you an aggressive exterior and a bland centre: the gradient is the same, it is simply steeper.

The three preparation steps that genuinely matter

Pressing: a modest gain, but a real one

Plain tofu contains 73.8 % water. A decent home press removes 10 to 20 % of the block’s weight. At 20 %, water content falls to about 67 % and protein mechanically rises from 13.4 to 16.8 g per 100 g. What matters in the kitchen is the space freed up: with the water gone, some of the marinade takes its place instead of pooling on the surface. The gain is real, but it concerns the first few millimetres, not the core.

Method, no dedicated gear required: take the block out, drain it, wrap it in a clean cloth, set it on a slightly tilted plate and put roughly 1 kg on top, a pan filled with water for instance. Fifteen to thirty minutes is enough. Beyond that the gain becomes marginal and the tofu starts crumbling at the edges. Extra-firm tofu, already lower in water, is fine with ten minutes.

Freeze and thaw: the only method that creates porosity

This is the technique missing from almost every page on the subject, and by a distance the most effective. Freezing a block of tofu, then thawing and pressing it, turns the smooth gel into a sponge-like structure. Ice crystals push the protein network aside as they form, and the water released on thawing leaves a network of pores behind.

A 2025 paper on tofu freezing processes tracked this and reports two useful results. The resulting structure is described as porous and elastic, with a taste of its own. And the soaking medium matters: over ten days of storage, pH dropped 10.9 % in the water-soaked batches against 3.8 % in the brine-soaked batches, while protein denaturation was more pronounced in the salted ones. Freezing does not just change the texture, in other words, it changes the product.

In practice: freeze the block in its packaging or a sealed bag, leave it 24 hours at -18 °C, thaw it overnight in the fridge, then press it firmly by hand over the sink. It will release a lot of water and turn yellowish and rubbery to the touch. Cut and marinated, that tofu soaks up liquid like a sponge, which fresh tofu never does. It is the preparation to choose when you want the flavour to reach the centre.

Blanching tempeh: useful, though not for the stated reason

Everyone says tempeh must be blanched to remove its bitterness. Tempeh is fermented by Rhizopus, and its flavour depends heavily on how far the fermentation has gone. Steaming or simmering it for five to ten minutes warms the block, softens the beans slightly and stops residual fermentation. That last point is the one that counts, particularly with home-made or very fresh tempeh.

The effect on absorption is less certain than usually claimed. Tempeh holds 63.7 % water, less than tofu, and the gaps between the beans already provide a route for liquid. Tempeh cut into 1 cm slices takes a marinade perfectly well, blanched or not. Blanch it if you find the flavour too assertive, not as a matter of principle.

Salt, the central issue and the one rarely covered

The WHO recommends under 2000 mg of sodium per day, equivalent to less than 5 g of salt. The global adult mean was 4278 mg of sodium in 2021, roughly 11 g of salt, more than double. In 2023, 1.7 million annual deaths were associated with excess sodium intake. The NHS uses a slightly higher ceiling, 6 g a day from age 11, with lower limits below that: 5 g from 7 to 10 years, 3 g from 4 to 6, 2 g from 1 to 3, less than 1 g under 1 year. Both bodies name soy sauce explicitly among the condiments to watch.

Here is what that means at the chopping board, using the 18.6 g of salt per 100 g from Ciqual:

1 level tablespoon, 15 g: 2.79 g of salt, or 56 % of the WHO maximum;
2 tablespoons, 30 g: 5.58 g, or 112 %;
3 tablespoons, 45 g: 8.37 g, or 167 %.

The usual proportion in an Asian marinade recipe is two tablespoons of soy sauce for two people. Split across two plates, that is 2.79 g of salt per person from the marinade alone. It is not a disaster inside an otherwise moderate day, it is simply a great deal more than the word “seasoning” suggests.

How to cut the salt without losing the flavour

The obvious move is to look for a reduced-salt soy sauce, which the NHS does in fact recommend. It works, but there is something better: replace part of the salty volume with acid and aromatics. The reduced-salt version in the table uses 10 g of soy sauce instead of 30, topped up with 25 g of lime juice and 15 g of cider vinegar. Result: 0.96 g of salt per serving instead of 2.82 g, close to a threefold cut, for a dish that still tastes properly seasoned because acidity and garlic occupy the space left behind.

Another route comes from a 2026 trial on tempeh powders. Tested as natural flavour enhancers in a vegetable broth with 282 consumer panellists, those powders supported sodium reductions of 20 and 30 % while maintaining acceptance. Roasted or dried tempeh, ground to a powder, therefore behaves much like an umami condiment. At home the lesson is simple: nutritional yeast, ground dried mushrooms, a little miso partly replacing the soy sauce all bring umami with far less sodium per gram.

The Swiss ordinance also gives usable numbers. A food is “low in sodium or salt” below 0.12 g of sodium per 100 g, “very low” below 0.04 g and “sodium-free” below 0.005 g. Converted to salt, those are 0.30, 0.10 and 0.0125 g per 100 g respectively. Plain tofu at 0.025 g sits under the “very low” threshold. Tempeh at 0.098 g slips just under 0.10 g. Once marinated the Asian way, both are at 1.96 g per 100 g, more than six times the most permissive threshold.

The four marinades, weighed

The quantities below are for 200 g of tofu or tempeh, two servings. The ratio of solid to marinade is deliberately low: a marinade the tofu swims in is waste, since only the fraction touching the surface does any work.

Asian, soy sauce and ginger

30 g soy sauce, 13 g sesame oil, 20 g maple syrup, 5 g chopped garlic, 5 g grated fresh ginger, 15 g lime juice. Total: 88 g of marinade, 193 kcal, 5.59 g of salt.

This is the reference version of the genre, and also the saltiest. If you make it as written, do not salt anything else in the meal. The halved-salt version described above tastes remarkably close. Maple syrup, at 62.6 g of sugars per 100 g according to Ciqual, is there for colour as much as taste: it is what glazes the surface during cooking, and it is what burns if the heat is too high.

Mediterranean, olive oil and herbs

30 g extra virgin olive oil, 20 g lemon juice, 6 g garlic, 10 g cider vinegar, dried thyme, rosemary and oregano, pepper. Total: 66 g, 279 kcal, 0.01 g of salt.

This marinade contains almost no sodium, which makes it the best option for anyone watching salt intake. In exchange it brings 30 g of fat, which becomes 23.5 g per serving once the tofu is counted. The Swiss nutrition recommendations published by the Federal Food Safety Office (in German) put the daily vegetable oil allowance at two tablespoons, around 20 g. A single plate of olive-oil-marinated tofu therefore exceeds that marker. Season lightly with salt during cooking rather than adding more oil.

Barbecue, smoky and sweet

60 g shop-bought barbecue sauce, 15 g cider vinegar, 10 g oil, 15 g maple syrup, smoked paprika, garlic powder. Total: 100 g, 213 kcal, 1.07 g of salt, 25.9 g of sugars.

Tempeh suits this better than tofu, because its dense texture holds up on a grill. The commercial barbecue sauce is the crux: 27.5 g of sugars and 1.77 g of salt per 100 g according to Ciqual. Used alone and generously, it takes over the dish. A serving of tempeh plus barbecue marinade nevertheless stays reasonable at 263 kcal and 0.63 g of salt, because the sauce is diluted by the vinegar and spread across 300 g of preparation.

Coconut curry

80 g coconut milk, 15 g soy sauce, 5 g oil, 5 g garlic, 5 g ginger, 15 g lime juice, curry powder and turmeric. Total: 125 g, 211 kcal, 2.86 g of salt.

Watch the invisible parameter here: coconut milk carries 16.5 g of saturated fat per 100 g. The 80 g in the recipe contain 13.2 g of it, and the finished serving reaches 8.3 g of saturated fat. It is the most saturated-fat-heavy of the four marinades, well ahead of the olive oil version. It still tastes excellent, it simply deserves to be seen for what it is rather than as the light exotic option.

Cooking: what forms in the pan

“Do not overcook it” circulates everywhere without explanation. Two families of compounds are involved, and the available data do not point where people assume.

Polycyclic aromatic hydrocarbons form when fat drips onto a heat source and the smoke returns to the food. A 2025 study on charcoal-grilled vegetables measured the effect of marinade ingredients on the sum of the four regulated PAHs. Red grape vinegar cut their formation by 75 %, cider vinegar by 68 %, lemon juice by 52 %, garlic powder by 34 % and black pepper by 30 %. An acidic marinade is therefore not merely a flavour choice: it measurably reduces the formation of these compounds on a grill. That is one more argument for acidity, and an argument against the idea that a purely fatty, sugary marinade would be equivalent.

Acrylamide forms differently, through a reaction between a reducing sugar and asparagine at high temperature in the absence of water. A 2024 analysis of pan-fried plant-based meat alternatives measured a maximum of 72 µg/kg in a soy flour patty fried at 200 °C, levels the authors place below the tolerable intake calculated by EFSA. For comparison, the Swiss ordinance on contaminants sets indicative values of 500 µg/kg for ready-to-eat chips and 750 µg/kg for crisps. Pan-fried tofu, high in water and low in reducing sugars, is not a risk food on that front.

That same ordinance deserves a clarification: the maximum PAH levels in its Annex 6 apply to heat-treated meat and fishery products, and no maximum is set for grilled vegetables or soy-based products. The absence of a threshold does not mean the absence of formation, it simply reflects the scope of the text.

Three settings cover it in practice. Medium heat rather than high, because the sugar in the marinade caramelises around 160 °C and blackens shortly after. Acidic marinade rather than purely fatty. And on a barbecue, a plate or a cooking sheet between food and embers, which stops fat falling onto the charcoal.

For the oven, 200 °C for 20 to 25 minutes on baking paper, pieces turned halfway, gives a consistent result. In a pan, the oil already in the marinade is usually enough; add very little more, or the tofu soaks it up. Set aside a small portion of marinade that never touched the raw product and brush it on at the end: that final pass is what produces the glaze.

Safety: four points that genuinely matter

Never reuse a marinade that has held the raw product without boiling it. Take out the finishing portion before you put the tofu or tempeh in. If you forgot, bring the marinade to a rolling boil before using it as a sauce.

Marinate in the fridge, never on the worktop. The Food Standards Agency guidance puts the fridge between 0 and 5 °C, the freezer around -18 °C, and caps at four hours the total time chilled food spends out of the fridge during preparation. Leftovers should be eaten within 48 hours or frozen. A cooked dish is cooled at room temperature and refrigerated within one to two hours. In Switzerland, articles 24 and 25 of the hygiene ordinance set the same requirement in legal terms: ready-to-eat foods liable to support the growth of pathogenic microorganisms must be kept at temperatures that prevent it, and the cold chain must not be broken. Frozen products are stored at -18 °C or below, with surface layers staying under -15 °C.

Honey is off limits before one year. Several sweet marinades, including the classic Mediterranean version, suggest a touch of honey. The NHS advises against honey before the age of one: it can contain bacteria capable of producing toxins in an infant’s gut and causing infant botulism, a very serious illness. If the dish is shared with a baby, swap the honey for maple syrup or drop the sweetener entirely.

Whole nuts should be avoided before five. Chopped cashews and peanuts scattered as a garnish are a choking hazard. The NHS allows nuts from the start of weaning provided they are crushed, ground or in butter form. Same source, same page.

A word on salt and children, since a marinated dish is often a family dish. The NHS advises against adding salt to a baby’s food or cooking water, and against using stock cubes. A serving of soy-marinated tofu contains 2.82 g of salt, more than the 2 g daily maximum set for a child aged 1 to 3. Serve the children’s portion before the sauce goes in.

How long to marinate, honestly

Resting time is the single most overrated parameter in this whole subject. Because diffusion is slow and thickness decisive, extending the wait produces diminishing returns very quickly.

For fresh pressed tofu, cut into 1 cm slices or 2 cm cubes, thirty minutes saturates the surface layer. Overnight makes a perceptible but modest difference, mostly along the edges. For freeze-thawed tofu it is the opposite: the porous structure absorbs liquid in fifteen to twenty minutes and the result is clearly better than fresh tofu at any duration. For tempeh in 1 cm slices, allow an hour; its density slows things a little without blocking them.

Turning the pieces once or twice during the rest is worth more than doubling the time, because the face sitting on the bottom of the dish bathes while the other dries out. A resealable freezer bag with the air pushed out solves that with no extra kit and no dish to wash. An airtight container is preferable if you want to avoid single-use plastic.

Common mistakes

Drowning the product in marinade. Only the fraction in contact does any work. Excess liquid dilutes the surface seasoning and ends up down the sink. The quantities given above, between 66 and 125 g for 200 g of product, are deliberately tight.

Expecting the marinade to tenderise. Acid denatures surface proteins, it does not transform the texture of a soy gel. What genuinely changes texture is pressing, freeze-thawing and cooking.

Salting on top of the soy sauce. A serving at 2.82 g of salt needs no addition whatsoever. Taste before you salt, every time, and taste the finished dish.

Cooking a sugary marinade over high heat. Maple syrup and barbecue sauce caramelise then blacken within tens of seconds. Medium heat, close attention, and glaze at the end rather than the start.

Marinating silken tofu. Its water content is far higher and its protein network far looser; it falls apart. Keep it for sauces, creams and desserts, as in our sweet silken tofu recipes.

Taking the marinade out of the fridge at the start of prep. The FSA’s four hours are cumulative, preparation included. Take it out at the last moment.

Reusing a raw marinade as a sauce. Covered above, and the only item on this list that is about safety rather than taste.

Adapting to different profiles

High blood pressure or sodium under watch. The Mediterranean marinade, at 0.03 g of salt per serving, is the only one of the four that works as written. The others can be salvaged by cutting the soy sauce threefold and compensating with citrus juice, vinegar and garlic.

Protein as the priority. Tempeh at 16.1 g per 100 g beats tofu at 13.4 g, and adds 6.2 g of fibre on top. A 120 g Swiss reference portion of tempeh supplies 19.3 g of protein and 7.4 g of fibre. Our complete guide to plant proteins covers portions and combinations in detail.

Energy intake under watch. The Mediterranean marinade is the heaviest in energy despite carrying no salt: 287 kcal per serving against 244 for the Asian one. Halving the oil brings the serving under 220 kcal with little flavour loss, provided you keep the acid.

Meals shared with young children. Serve the children’s portion before the salty marinade, swap honey for maple syrup, and offer nuts ground rather than chopped.

Cooking without soy. Neither tofu, tempeh nor soy sauce qualifies. Seitan takes a marinade very well and our page on homemade seitan covers the basics; for the sauce, concentrated mushroom stock plus vinegar stands in adequately for soy sauce umami.

What this page cannot tell you

The nutritional values come from the Ciqual 2020 table, built on products sold in France. A Swiss tofu set with nigari rather than calcium sulphate will have a different calcium content, and soy sauces vary a great deal between brands: read the label, salt content is always given per 100 g.

The PAH measurements cited concern charcoal-grilled vegetables, not tofu. The inhibition mechanism through the phenolic compounds of the marinade is the same, but transferring it across is a reasonable extrapolation rather than a direct measurement. Likewise, the salt diffusion study covers a casein gel, not a soy gel; the order of magnitude is relevant, the exact value is not.

Finally, the comparison between marinades assumes all the liquid is eaten. If you drain and discard, the salt and sugars per serving are considerably lower, but no published data says by how much, because it depends on thickness, time and how thoroughly you drain.

Frequently asked questions

Is pressing tofu really necessary? For shop-bought firm tofu, yes, fifteen minutes makes a difference. For extra-firm, ten minutes will do. For freeze-thawed tofu, hand pressing is essential and replaces everything else.

Can a marinade replace cooking? No. Acidity does not cook a soy gel and does not reduce a microbial load. Tofu and tempeh sold in Switzerland are pasteurised products that can be eaten without cooking, but the raw marinated result is soft and dull.

How long does a marinade prepared in advance keep? With no contact with a raw product, in a sealed jar, a few days in the fridge between 0 and 5 °C. Once it has held raw food, it is discarded or boiled before use.

Does tempeh have to be blanched? Only if the flavour strikes you as too strong. Five to ten minutes of steaming is enough. The belief that blanching is essential to absorption is not supported.

Can you freeze tofu that is already marinated? Yes, and it stacks both effects: freezing creates the porosity while the marinade is already in place. Thaw in the fridge, never at room temperature, and press lightly before cooking.

Is tamari less salty than soy sauce? Not necessarily. Tamari is made without wheat, which matters to people avoiding gluten, but its salt content is in the same range. Only the label settles it.

What should I do with the leftover marinade after cooking? Reduce it in the pan with the pieces: it coats them, and nothing is wasted. That practice is exactly why the whole marinade is counted in the table above.

Does an acidic marinade damage tofu? It softens the surface layer beyond several hours. For a whole lemon on thin tofu, stay under two hours; past that the edges turn mealy.

Going further

If you want recipes that fit into under fifteen minutes, our quick marinades for tofu and tempeh work from the same thin-slice principle. To choose between the three main bases, the comparison of tofu, tempeh and seitan gives the criteria dish by dish. To make your own tempeh, everything is in our page on homemade tempeh. On the cooking side, grilled vegetables and tofu and cold smoking tofu extend this guide naturally, as does organising a vegetarian barbecue. And if salt is your main concern, our page on seasoning without salt goes further on herbs, spices and citrus, while our article on the Swiss tofu economy explains where the soy you are marinating comes from.