In need of a vegan alternative to fish sauce? You can make your own using dried shiitake mushrooms.
[Ed. note: Learn more about this America's Test Kitchen recipe and general uses for fish sauce, oyster sauce in America's Test Kitchen explores three classic Asian sauces.]
Combine mushrooms with water, salt, and soy sauce. Simmer over medium heat until reduced by half. Strain, cool, and refrigerate the sauce for up to 3 weeks.