Clean the peppers, zucchini or tomatoes, then put the onion to stew on the water, add finely chopped mushrooms, then add the eggplant, 50ml of minced tomato, finely chopped peppers and zucchini, and then the grated celery. When stewed add 1 tablespoon of olive oil. With athis mixture fill vegetables (peppers or zucchini), cover with one slice of tomato and sprinkle with 1 tablespoon of sesame seeds. Boil in a saucepan for 10 minutes, then bake in the oven.