Salt the onions with minced meat and pepper to taste, add the tomato paste.
Zucchini grate, salt, squeeze the excess juice.
Cut tomatoes into rings.
Grease the baking dish with butter, put half of the zucchini, half the minced meat on top, again the zucchini, then the tomatoes. Beat eggs with sour cream and salt a little and pour on top, sprinkle with cheese.
Bake a casserole from zucchini with minced meat and tomatoes in an oven preheated to 180 degrees for 35 minutes.