Peel 3 onions and garlic. Dice the onions, press the garlic through a garlic press. Heat the oil in a large pan, crumble the minced meat into it and fry it thoroughly. Finally add onions and garlic, fry briefly and season with oregano, salt and pepper.
Stir in tomato paste and add 1/8 litre of water. Add the tomatoes and chop a little in the pan. Bring to the boil and stir in the sauce thickener. Bring to the boil again briefly and set aside.
Clean, wash and cut the savoy cabbage into strips. Peel and chop the remaining onion. Heat the fat in a pot and fry the onion in it. Add cabbage, also braise briefly and deglaze with stock.
Season with salt, pepper and nutmeg, bring to the boil and braise covered for about 10 minutes. Grease a wide casserole dish and alternate layers of cabbage and bolognese. Wash and clean the tomato, cut into slices and place on the top layer of bolognese.
Sprinkle thickly with gouda and parmesan. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 45 minutes. Garnish as desired with fresh oregano. Fresh farmhouse bread tastes good with it.