While tofu is baking, add onion, garlic, zucchini, and chopped green onions to a large skillet with ¼ cup water. Cook over medium-high heat for about 5 minutes, stirring frequently. Add liquid smoke, black bean paste, rice wine, soy sauce, oyster sauce, sugar, water, and black pepper. Stir together well, bring to a boil, and cook another 3 minutes, or until the onions and zucchini are tender.