Peel the potatoes, cut them into slices, season with salt and nutmeg and put them into a flat gratin dish (approx. 1/4 litre capacity). Mix stock and cream, pour over the potatoes and sprinkle with 1 tablespoon of cheese.
Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 20-25 minutes. In the meantime, wash the chives, cut half into small rolls, mix with the remaining cheese and layer between the two slices of liver cheese.
Fix it with 2 wooden sticks. Fry Leberkäse for about 4 minutes at medium heat in oil. Wash lettuce and tomato. Cut the tomato into slices, removing the stalk. Arrange Leberkäse with tomato wedges, lettuce leaves and potato gratin, garnish with remaining chives.