Zucchini Lasagna

Ingredients

• 1/4 c. margarine or 4 Tbsp. oil
• 4 c. zucchini, sliced 1/4-inch thick
• 1/2 c. onion, finely chopped
• 2 Tbsp. flour
• 4 c. canned whole tomatoes, undrained
• 1/2 c. tomato paste
• 1 beef flavored bouillon cube
• 1 tsp. oregano
• 1 tsp. sugar
• 1/2 tsp. garlic powder
• 8 ounces lasagna noodles, cooked
• 2 c. Ricotta cheese
• 1/2 c. each Parmesan and Romano cheese, grated (mixed)
• 2 c. shredded Mozzarella cheese