For the Bolognese peel onions and garlic, dice finely. Heat the oil in a pan. Fry the minced meat in it until crumbly. Fry the onion and garlic briefly. Season with salt and pepper.
Stir in tomato paste and sweat it. Add tomatoes, 1/8 l water and herbs, bring to the boil, cover and simmer for about 10 minutes. Season to taste with salt, pepper and sugar.
Meanwhile, grate the parmesan finely for the béchamel sauce. Melt the butter. Briefly sauté the flour in it until light brown. Gradually add milk and 1/4 l water while stirring. Bring to the boil, stir in the stock and simmer for about 5 minutes.
Melt the Parmesan cheese in it, except for 2 tablespoons. Season to taste with salt and pepper.
Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2). Spread a little béchamel thinly on the bottom of four small or one large rectangular casserole dish. Alternate layers of lasagne plates, bolognese and béchamel.
Finish with lasagne and béchamel.
Cut mozzarella into thin slices. Cover the lasagne with mozzarella and sprinkle 2 tablespoons of parmesan on top. Bake in a hot oven for about 45 minutes.