The Oyster Sauce Substitute Every Vegan Needs In Their Life - Tasting Table
Briefly

Oyster sauce is a thick, rich condiment popular in Chinese fare, made by slow-simmering oysters in hot water until the resulting juices caramelize.
Although the main ingredient in oyster sauce is oyster extract, mushroom broth serves as a perfect vegan substitute, capturing its umami flavor without seafood.
Experiment with measurements of mushroom broth to taste, and thicken it to mimic oyster sauce by slow-simmering it or adding cornstarch slurry.
You can purchase mushroom broth in most grocery stores or make homemade broth by simmering fresh mushrooms with vegetables and herbs.
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