Vegetarian Bibimbap
1 (4.5 ounce) can sliced mushrooms, drained 1 cup carrot matchsticks 1 cup zucchini matchsticks 1 tablespoon butter 2 cups cooked and cooled rice 2 tablespoons sesame oil 2 tablespoons soy sauce 3 eggs 3 teaspoons sweet red chili sauce, or to tast… 6 ounces canned bamboo shoots, drained ¼ teaspoon ground black pepper ½ (14 ounce) can bean sprouts, drained ⅓ cup sliced green onions ⅛ teaspoon salt to taste