Umami soy sauce is a seasoned, often slightly sweetened soy sauce that amplifies the savory depth of any dish. Unlike standard soy sauce, which is salty and one-dimensional, umami soy sauce is blended with ingredients like kombu, mushrooms, or bonito flakes to boost glutamates, creating a richer, rounder flavor. This recipe-style guide shows you how to make your own umami soy sauce at home and how to use it to elevate everything from stir-fries to marinades.
Ingredients
- 1 cup (240 ml) low-sodium soy sauce (or tamari for gluten-free)
- 1 (4-inch / 10 cm) piece dried kombu (kelp)
- 1 cup (240 ml) water
- 1/2 oz (15 g) dried shiitake mushrooms (about 4-5 caps)
- 1 tbsp (15 ml) mirin (sweet rice wine) or 1 tsp (5 ml) honey
- 1 clove garlic, smashed (optional)
- 1 tsp (5 ml) toasted sesame oil (optional, for finishing)
Instructions
- In a small saucepan, combine the soy sauce, water, kombu, and dried shiitake mushrooms. If using garlic, add it now.
- Place the saucepan over medium heat and bring to a gentle simmer. Do not let it boil vigorously—boiling can make the kombu slimy and bitter.
- Reduce heat to low and let it simmer gently for 5 minutes. The mushrooms and kombu will rehydrate and release their umami compounds into the liquid.
- Remove from heat and let the mixture steep for an additional 10 minutes (this is part of the total time).
- Strain the liquid through a fine-mesh sieve, discarding the solids (or reserve the mushrooms for another use, like slicing into a stir-fry).
- Stir in the mirin or honey until fully dissolved. If using sesame oil, stir it in now.
- Let the umami soy sauce cool to room temperature, then transfer to a clean glass jar or bottle with a tight-fitting lid.
Tips
- Substitutions: For a gluten-free version, use tamari or coconut aminos (though coconut aminos will be sweeter and less salty). If you don’t have mirin, use a pinch of sugar or a teaspoon of honey. You can also add a strip of lemon zest for brightness.
- Storage: Keep the umami soy sauce in the refrigerator. It will keep for up to 1 month. The flavor will deepen over time, but it should still taste fresh and salty, not sour.
- Common mistake: Don’t boil the mixture vigorously. A gentle simmer is enough to extract flavor without making the kombu slimy. Also, don’t skip the steeping time—that’s where the depth really develops.
- Adjust salt: If you prefer a less salty sauce, use low-sodium soy sauce and add a splash of water to taste. If you want it saltier, use regular soy sauce.
Serving Suggestions
Use umami soy sauce as a dipping sauce for dumplings, gyoza, or spring rolls. Drizzle it over steamed rice, grilled vegetables, or a bowl of ramen. It also makes an excellent marinade for chicken, beef, or tofu—use about 1/4 cup (60 ml) per pound of protein, and marinate for at least 30 minutes.
Variations
- Spicy Umami Soy Sauce: Add 1 teaspoon (5 ml) of chili oil or a pinch of red pepper flakes during the simmering step.
- Citrus Umami Soy Sauce: Add a 2-inch strip of orange or yuzu zest to the simmering liquid, then remove before storing.
- Garlic-Ginger Umami Soy Sauce: Add 1 teaspoon (5 g) of grated fresh ginger along with the garlic for a brighter, more aromatic sauce.
- Mushroom-Forward Umami Soy Sauce: Double the amount of dried shiitake mushrooms and skip the kombu for a purely mushroom-based umami.
Storage and Reheating
Store the umami soy sauce in a sealed glass jar in the refrigerator for up to 1 month. The sauce is meant to be used cold or at room temperature, so there is no need to reheat it. If you prefer it warm, heat only the amount you need in a small saucepan over low heat for 1-2 minutes—do not boil. The sauce can also be frozen in ice cube trays for up to 3 months; thaw cubes in the refrigerator overnight.
Frequently Asked Questions
Can I use this umami soy sauce in place of regular soy sauce in any recipe? Yes, but keep in mind it is slightly sweeter and more concentrated in flavor. Start by using about 25% less than the amount of regular soy sauce called for, then adjust to taste.
Is umami soy sauce the same as mushroom soy sauce? Not exactly. Mushroom soy sauce is a type of dark soy sauce that has been infused with mushroom extract. Umami soy sauce is a broader term that can include kombu, bonito, or other umami-rich ingredients. This recipe is a homemade version that is lighter and less sweet than mushroom soy sauce.
Can I make this without kombu? Yes, you can use only dried mushrooms, or add a piece of dried anchovy (niboshi) for a fishy umami. If you use anchovy, simmer for only 3 minutes to avoid bitterness.
Why did my umami soy sauce become cloudy? Cloudiness is usually caused by the mirin or honey not fully dissolving, or by tiny particles from the mushrooms. To avoid this, stir well and strain through a fine-mesh sieve lined with a coffee filter.
How long does umami soy sauce last at room temperature? Because it contains water and no preservatives, it should not be left at room temperature for more than 2 hours. Always refrigerate it to prevent spoilage.
Can I use fresh shiitake mushrooms instead of dried? Yes, but fresh mushrooms have a milder flavor. Use about 1 cup (70 g) of sliced fresh shiitake and simmer for 10 minutes instead of 5. The sauce will be less intense but still delicious.
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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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