For a twist on the classic beef with green peppers, try making a stir-fry with black bean sauce. Thinly sliced beef is stir-fried with green peppers and a savory black bean sauce made with fermented black beans, garlic, and ginger. The black bean sauce adds a rich and umami flavor to the dish, while the green peppers provide a fresh and crunchy texture. Serve this stir-fry over steamed rice for a delicious and satisfying meal.