The sauce is cooked 30-45 minutes in advance. Fry chopped onion with the crushed garlic in olive oil until the onion softens. Add the mince and fry it until brown. Excess grease is poured. Add other products to the sauce and stir well. Allow to simmer for about an hour. pan lasagna prepared according to package directions and drain. Arrange a layer of pastry into a greased rectangular pan, pour on top sliced ​​ricotta cheese, mozzarella sliced ​​feta cheese, the meat sauce and sprinkle with feta cheese Parmesan. So 2 more rows - 3 lines total. Bake in the oven at 160 C for 45 minutes uncovered.