Mushroom San Choy Bau is a vegetarian twist on the classic Chinese dish. This recipe features a flavorful mixture of mushrooms, water chestnuts, and other vegetables, all cooked in a savory sauce and served in lettuce cups. The combination of the umami-rich mushrooms, crunchy water chestnuts, and fresh lettuce creates a light and satisfying dish. Mushroom San Choy Bau is perfect for a quick and healthy weeknight dinner or as an appetizer for a dinner party.