Scrape zucchini skins and wash. Make a slit lengthwise and scrape out fleshy part.Place plenty of water to boil. Add some salt.Put in the zucchini and boil 2-3 minutes.Drain them and keep aside.In a pan heat oil, fry onions and garlic for a minute.Add tomato, scraped pulp, 2 tbsp. bread crumbs, salt, pepper.Transfer to a baking dish. Sprinkle the remaining crumbs and cheese over the zucchini.Bake in a hot oven for 10-12 minutes.Serve hot with pita or other bread.