Peel and finely chop the onion and garlic. Fry both in hot oil. Add the minced meat and fry until crumbly. Add the chopped tomatoes and herbs and simmer for 5 minutes. Season to taste with salt and pepper.
Wash, clean and slice the zucchini lengthwise. Wash tomatoes and also cut them into slices. Grease a square form (22x22 cm). Put 2 lasagne plates in it. Cover with half the sauce.
Layer half of the tomatoes and zucchini slices. Sprinkle the vegetable layers with a little salt. Add the rest of the lasagne sheets, chopped sauce, zucchini and tomato slices. Sprinkle with cheese and bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 35-40 minutes.
Divide into 4 portions and garnish with herbs as desired.