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Shio Koji substitute

Best substitute

White miso thinned with water

Use 2 teaspoons white miso plus 1 teaspoon water for every 1 tablespoon shio koji

Best for salad dressings and dips

Taste and texture differ

The closest thing in most kitchens, and a genuine substitute for the seasoning job.

Other shio koji substitutes

Ranked, with the exact amount to use

Substitutes for Shio Koji with ratios

  1. 2Salt plus a little sugar, as a light dry brine

    Taste and texture differ

    Use about 1 teaspoon fine salt plus ½ teaspoon sugar for every pound of protein, rested 30 to 60 minutes

    The honest answer for marinades, and it does part of the job well.

    What changes
    Best for
    chicken, pork and fish before grilling or roasting, steak, vegetables before roasting, any recipe where shio koji was the only seasoning

    A light salt-and-sugar brine seasons the protein through, helps it hold moisture and encourages browning, which covers a good deal of what shio koji delivers and is why the results are still very good. What it cannot do is enzymatic tenderising, so a chicken thigh will taste well seasoned and juicy but will not have that particular soft, almost velvety texture. It also brings none of the savoury depth, so add half a teaspoon of soy sauce per pound if you want to close that gap. Do not extend the resting time hoping for tenderness; it will only get saltier.

  2. 3Sake lees paste (sake kasu), or plain sake with salt

    Different taste

    Use the same amount for sake kasu; or 1 tablespoon sake plus ¼ teaspoon salt per 1 tablespoon shio koji

    Another koji-derived product, and closer in character than almost anything else.

    What changes
    Best for
    marinating fish, especially salmon and cod, pork and chicken, pickling vegetables, soups and hot pots

    Sake kasu is the pressed lees left after brewing sake, so it comes from the same koji-on-rice process and carries a similar sweet-funky fragrance plus some residual enzyme activity, meaning it does tenderise to a degree. It is more alcoholic and yeastier, so a marinade made with it smells distinctly of sake and needs cooking off, and it is thicker and pastier. Plain sake with salt is a much weaker version that adds aroma and a little tenderness but almost no umami or body, and is best in a quick fish marinade.

  3. 4Light soy sauce or usukuchi

    Taste and texture differ

    Use 2 teaspoons light soy sauce for every 1 tablespoon shio koji, and reduce other salt in the dish

    Easy and effective for umami and salt, entirely wrong for colour and texture.

    What changes
    Best for
    soups, broths and simmered dishes, dressings and dipping sauces, stir-fries, seasoning cooked vegetables

    Soy sauce delivers salt and glutamate efficiently, which is the loudest part of what shio koji contributes, and in a soup or a stir-fry the swap is barely noticeable. The problems come elsewhere: it is a thin dark liquid rather than a pale thick paste, so it will not cling to a piece of fish or coat a vegetable, and it will brown a dish that was meant to stay pale. It is also sharper and saltier with none of the mellow sweetness, so a quarter teaspoon of mirin or sugar per tablespoon helps considerably.

  4. 5Amazake or rice malt syrup plus salt

    Different taste

    Use 1 tablespoon amazake plus ¼ teaspoon salt for every 1 tablespoon shio koji

    Comes at it from the sweet side, and useful when the gentle sweetness is what you are after.

    What changes
    Best for
    marinades for pork and chicken, dressings, glazes, vegetable pickles

    Amazake is rice fermented with koji and no salt, so it is the sweet sibling of shio koji and shares that distinctive mellow rice-koji aroma, and unpasteurised versions retain enzyme activity that will tenderise. Add the salt and you are genuinely close. The catch is that it is much sweeter, so a marinade made with it caramelises faster and can scorch on a grill, and it lacks the salty savoury balance unless you measure the salt properly. Rice malt syrup is a distant relative with the sweetness but none of the fermented depth.

  5. 6Make your own shio koji

    Close match

    200g dried rice koji plus 60g salt plus 300ml water, left at room temperature 7 to 10 days

    Not a substitute but the answer if you cook Japanese food regularly, and it is nearly effortless.

    What changes
    Best for
    all the uses above, marinating any protein, as a general-purpose salt replacement, pickling vegetables

    Mix the three ingredients in a clean jar, cover loosely and stir once a day. It is ready when the rice grains have gone soft and the mixture smells sweet and faintly like melon or chestnut rather than raw. The salt proportion here, roughly 13 percent of the total, is what keeps it safe while the enzymes work, so do not reduce it. Once it smells sweet, refrigerate it, where it keeps for months. Dried rice koji is sold at Japanese grocers and keeps in the freezer, and this is dramatically cheaper than buying the paste.

What is Shio Koji?

Shio Koji is a soft Japanese seasoning paste, also written shiokoji or salt koji, made from cooked rice inoculated with koji mould then blended with salt and water and left to sit until the enzymes break the rice down into a sweet, savoury, slightly funky slurry, and it does two jobs at once: it salts food and it tenderises it.

Cooking tips

  • The standard measure is about 10 percent of the weight of what you are seasoning, so roughly 1 tablespoon of shio koji per 5 ounces of chicken or fish. If you are substituting salt instead, remember shio koji is only around 12 or 13 percent salt, so a tablespoon of it carries about as much salt as a scant half teaspoon of table salt, not a whole spoonful.
  • Do not marinate in shio koji for too long. Thirty minutes to a few hours suits fish and thin cuts, and overnight suits chicken thighs or pork, but two days will turn a fillet mushy because the enzymes keep working. This over-tenderising is the single most common mistake and it cannot be undone.
  • Wipe most of it off before cooking. Shio koji contains sugars from the broken-down rice, so a thick coating burns quickly on a grill or under a broiler and tastes acrid. Scrape the paste back to a thin film and cook over moderate rather than fierce heat.
  • If you substitute miso or soy sauce, cut the other salt in the recipe. Both are considerably saltier per spoon than shio koji, and a dish seasoned as though they were equivalent will come out too salty even though the flavour direction is right.
  • Do not use shio koji or any substitute to modify a tested pickling, canning, curing or fermenting recipe. Salt concentration and acidity in preserved foods are safety parameters rather than flavour choices, and altering them carries a real botulism risk. Follow tested recipes exactly and see the National Center for Home Food Preservation for guidance.

Frequently asked questions

Can I just leave it out?

If shio koji was one seasoning among several, you can skip it and add a little salt to compensate, and the dish will be fine if slightly less savoury. If it was the marinade, do not simply omit it, because the protein will end up unseasoned and drier. A light salt-and-sugar brine takes two minutes and covers most of the loss apart from the tenderising.

Is miso a good substitute for shio koji?

For flavour, yes, and white miso is the best everyday swap because both are koji ferments. Use about two-thirds as much since miso is saltier, thin it with water, and add a pinch of sugar. For tenderising meat, no, because the enzymes in most jarred miso have been deactivated by pasteurisation. That is the one job miso cannot take over.

What actually makes shio koji tenderise meat?

Live enzymes. The koji mould produces proteases that break down proteins and amylases that break down starches into sugars, and those enzymes keep working in the paste. That is why shio koji softens meat and deepens its savour in a way that salt alone cannot, and it is also why leaving something in it for days turns the texture unpleasantly soft.

How much salt is in shio koji, and how do I swap salt for it?

Typically around 12 to 13 percent salt by weight, which is much less than it looks. As a rough guide, a tablespoon of shio koji carries about as much salt as a scant half teaspoon of table salt. So if you are replacing a tablespoon of shio koji with plain salt, use roughly a half teaspoon, then add something savoury such as half a teaspoon of soy sauce for the umami you have lost.

Is shio koji gluten free and vegan?

Plain shio koji made from rice koji, salt and water contains no gluten and no animal products, so it is both, and it is a useful savoury seasoning for anyone avoiding soy sauce. Always check the label, since some commercial products add other ingredients, and note that barley koji versions exist and do contain gluten. Miso, the common substitute, usually contains soy and sometimes barley.

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