This is a vegetarian and vegan chinese stir-fry recipe with chinese black bean sauce and plenty of asian stir-fry vegetables, including shiitake mushrooms, red bell peppers, and green onions. As with most vegetable stir-fry recipes, you can vary the vegetables and the amounts without too much trouble, so feel free to experiment with whatever you like or have on hand. The recipe calls for black bean sauce, which, like hoisin sauce, tends to be one of those "Love it or hate it" Flavors, particularly for us westerners who aren't accustomed to authentic chinese flavors. If you're unsure, use a little less than the recipe calls for, or thin it out with a bit of water to dilute the flavor.