Quiche, Onion II

Ingredients

• 1 large onion, sliced
• 2 tablespoons reduced-calorie margarine
• 2 cups mushrooms, sliced
• 2 cups tofu
• 2 tablespoons oil
• 1/2 teaspoon garlic powder
• 2 tablespoons lemon juice
• 1 teaspoon salt, or 1 tablespoon soy sauce
• 2 tablespoons nutritional yeast flakes (optional; gives a cheesy flavor)
• 2 tablespoons flour
• 1 9" pie shell