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Use the zucchini slices to cover the bottom of a baking dish. Spread 1/2 cup of tomato sauce on the zucchini and then sprinkle on ricotta and mozzarella cheese to your liking. Top the cheese with a few rounds from a sliced red onion, and continue this layering process two more times. Top the dish with the last zucchini slices, and a little bit of tomato sauce and cheese, then add pepper. Bake the dish at 400 degrees for 60-70 minutes