Wash the potatoes and cook in boiling water for about 20 minutes. Then rinse with cold water, peel and leave to rest. In the meantime remove the outer savoy cabbage leaves. Cut out the stalk wedge-shaped, loosen all leaves.
Cook in boiling salted water for about 10 minutes, then drain. Cut the potatoes into slices. For the red sauce, peel onion and garlic and dice finely. Melt 1 tablespoon of fat.
Fry the onion and garlic in it. Stir in tomato paste, dust with 1 tablespoon of flour. Add tomatoes and chop. Add 200 ml water. Season with salt, pepper and oregano. Let it boil down for 5 minutes at high heat.
For the light sauce melt the remaining fat. Sweat the remaining flour in it. Add stock and cream while stirring constantly. Melt the cheese triangle in it. Season to taste with salt and pepper. Grate the gouda.
Fill prepared ingredients alternately into a suitable form (approx. 30 x 20 cm) (light sauce, savoy cabbage, light sauce, grated cheese, red sauce, potatoes, light sauce, grated cheese, savoy cabbage, light sauce, red sauce, potatoes, light sauce, grated cheese)
Sprinkle with remaining cheese and bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for about 40 minutes. Serve garnished with oregano bouquets.