Sauté onion and garlic in oil until translucent.
Add tomatoes and bring to boiling point, then simmer for 1/2 hour.
Add tomato paste diluted with 3 cans of water and simmer for at least 1 hour.
Add parsley, basil, oregano to taste and simmer a few minutes longer.
Coat zucchini slices with flour and sauté lightly in oil. Layer zucchini in baking dish, cover with sauce and then parmesean cheese.
Repeat until all zucchini is used. Top with mozarella cheese. Cover and bake 30 min. at 350° F. Uncover last 15 min.
Servings: 1