Clean the savoy cabbage and blanch in boiling salted water for about 3 minutes. Remove and immediately rinse in cold water. Melt the fat. Add 2 tablespoons of flour and sweat for about 2 minutes, stirring continuously.
Quickly add milk and broth while stirring. Bring to the boil, cook for about 1 minute and season with salt, pepper and nutmeg. Peel onion and cut into cubes. Heat the oil in a pan. Add minced meat and fry for about 10 minutes.
After 5 minutes add tomato paste and onion. Dust with 1 tablespoon of flour. Add the tomatoes 2 minutes before the end of the cooking time and chop coarsely with a spatula. Wash the thyme, shake dry, pluck leaves from the stalks except for a little to garnish.
Wash the basil, shake dry, pluck the leaves from the stalks and, except for a little to garnish, cut into strips. Season sauce with thyme, basil, salt and pepper. In the greased form (approx. 2 litres capacity) layer bèchamel sauce, lasagne plates, minced sauce, savoy cabbage one after the other.
Repeat 2-3 times depending on the height of the mould. Finish the last layer with lasagne sheets and bèchamel sauce. Wash, clean and slice the tomato and spread on the lasagne. Sprinkle with cheese.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 45 minutes. Cut lasagne into pieces and arrange on plates. Garnish with thyme and basil.