Soy Sauce and FODMAPs: Make a Low-FODMAP Sauce

This quick low-FODMAP soy-ginger sauce combines regular soy sauce, fresh ginger, rice vinegar, sesame oil, and a little maple syrup. Toss it with hot rice, vegetables, tofu, or cooked meat; unlike many bottled stir-fry sauces, this version leaves out onion and garlic, common high-FODMAP additions.

Ingredients

¼ cup (60 ml) regular soy sauce or tamari
2 tablespoons (30 ml) unseasoned rice vinegar
1 tablespoon (15 ml) pure maple syrup
1 tablespoon (15 ml) toasted sesame oil
1 teaspoon (5 ml) finely grated fresh ginger
1 teaspoon (5 ml) toasted sesame seeds
1 tablespoon (15 ml) water, plus more to taste
1 teaspoon (3 g) cornstarch, optional, for a thicker sauce
1 tablespoon (15 ml) cold water, only if using the cornstarch

Instructions

Measure the soy sauce, rice vinegar, maple syrup, sesame oil, grated ginger, sesame seeds, and 1 tablespoon water into a small bowl or jar. Whisk or shake until the maple syrup is fully incorporated. Taste and add a little more water if the flavor is too salty or intense.
Use the sauce as a dressing or marinade, or warm it for serving. To thicken it, first stir the cornstarch with the separate tablespoon of cold water until smooth. Pour the sauce into a small saucepan and bring it to a gentle simmer over medium-low heat, stirring. Stir in the cornstarch mixture and cook for 30–60 seconds, until glossy and slightly thickened. Do not add dry cornstarch directly to the sauce, or it may form lumps.
Pour over food just before serving, or toss with cooked ingredients in a pan for 30–60 seconds to coat. If using it as a marinade for raw meat or seafood, keep the food refrigerated while marinating and discard marinade that has touched raw food; make a fresh batch for serving.

Tips

Choose the right soy sauce: Plain soy sauce and tamari are made from fermented ingredients and are generally considered low-FODMAP in typical recipe portions. Tamari is often wheat-free, but check the label if you need to avoid gluten; soy sauce itself usually contains wheat. Formulations vary, so read ingredient lists and serving guidance.
Skip seasoned sauces: Avoid soy-based stir-fry sauces that list onion, garlic, honey, or high-FODMAP sweeteners if you are preparing this for a low-FODMAP meal. Some products contain garlic or onion powder even when the front label emphasizes soy.
Adjust the salt and sweetness: Different soy sauces vary in saltiness. Start with the listed water, taste, then dilute a teaspoon at a time. Reduce the maple syrup for a sharper sauce or add a little more for a sweeter glaze.
Keep the ginger fresh: Finely grate it so it distributes evenly. If using ground ginger instead, start with ⅛ teaspoon (about 0.25 g); it tastes warmer and less bright than fresh ginger.

Serving Suggestions

Spoon the sauce over a bowl of steamed rice with cooked carrots, bell pepper, zucchini, or green beans. It also works with firm tofu, tempeh, or cooked chicken, pork, beef, or fish. For a complete plate, add a portion of rice or another suitable grain and vegetables, then drizzle on the sauce rather than flooding the bowl; its soy flavor is concentrated.

Use the unthickened version as a quick dressing for rice noodles or as a dip for cooked dumplings whose filling and wrappers suit your needs. For a glaze, warm and thicken it as directed, then toss it with hot cooked ingredients. Add extra sesame seeds or sliced scallion greens if desired; the green tops provide a different flavor from the white bulb, but check personal tolerance and portion guidance.

Variations

Citrus-ginger: Replace 1 tablespoon (15 ml) of the rice vinegar with lime juice. This gives the sauce a brighter, tangier finish.
Chili sesame: Add ¼ teaspoon (about 0.5 g) red pepper flakes or a small amount of chili oil. Check chili oil ingredients for garlic or onion, which can occur in infused products.
Gluten-free: Use tamari labeled gluten-free rather than standard soy sauce. Tamari is commonly made without wheat, but labels and recipes differ, so verify the package.
Less sweet: Leave out the maple syrup or use 1 teaspoon (5 ml). The result will be saltier and more sharply acidic, so add water to balance it.

Storage and Reheating

Transfer leftover sauce to a clean, covered container and refrigerate within 2 hours of preparation. Use within 3–4 days. Shake or stir before using, since sesame oil may separate. The sauce can be served cold; if you prefer it warm, heat only the amount needed in a small saucepan over low heat, stirring, until steaming. Do not return sauce that has touched raw meat, poultry, seafood, or their utensils to the stored batch. Freeze extra sauce in a freezer-safe container for up to 2 months for best quality, then thaw in the refrigerator and stir well; a cornstarch-thickened sauce may need whisking after thawing.

Frequently Asked Questions

Is soy sauce low-FODMAP?
Plain soy sauce is generally treated as low-FODMAP in typical serving portions. FODMAP content and serving recommendations can vary by product and testing, so check current guidance from a reliable FODMAP resource and follow your own tolerance. This recipe makes four servings, with about 1 tablespoon (15 ml) sauce per serving before any extra water.

Is tamari better than soy sauce for FODMAPs?
Not necessarily. Both plain soy sauce and tamari can fit a low-FODMAP recipe in suitable portions. Tamari is useful when avoiding wheat, but it is not automatically gluten-free; read the label. Choose an unseasoned product without added garlic or onion.

Does soy sauce contain garlic or onion?
Plain soy sauce typically does not, but flavored sauces, marinades, and stir-fry sauces may include garlic, onion, or their powders. Read the full ingredient list rather than relying on the product name or front label.

Can I make this sauce without sesame oil?
Yes. Use a neutral cooking oil, such as canola, for a milder sauce, or omit the oil and add a little water. Toasted sesame oil gives the recipe its nutty aroma, so leaving it out will make the flavor less rich.

Can I use this as a marinade?
Yes, but marinate food in the refrigerator, not on the counter. Keep raw meat or seafood separate from ready-to-eat food, and discard marinade that has contacted raw ingredients. For a serving sauce, reserve a clean portion before adding the raw food.

Why is my sauce too salty?
Brands differ in saltiness, and reduced-sodium soy sauce can also vary. Whisk in water a teaspoon at a time, then adjust with a little more vinegar or maple syrup if needed. Avoid adding extra soy sauce until you have tasted the diluted mixture.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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