Peel and wash the potatoes. Cook covered in salted water for about 20 minutes
Clean the cabbage, cut out the stalk. Remove 12 large leaves, wash and cook in boiling salted water for 4-5 minutes (use the rest of the cabbage for other purposes). Quench leaves, cut thick veins flat
Grate the cheese roughly. Drain potatoes and mash with milk and 1-2 tbsp butter. Stir in cheese. Season with salt and nutmeg
Place 1-2 tablespoons of puree in the middle of each savoy cabbage leaf. Wrap the edges of the leaves together to form a package
Place the savoy cabbage packages in a large, greased casserole dish with the seams facing downwards. Spread 2 tablespoons of butter in flakes over it. Pour on 1/4 l stock. Cover and braise in a preheated oven (electric range: 200 °C/circulating air: 175 °C/gas: level 3) for 40-45 minutes.
Drain chanterelles well. Peel and finely chop the onion. Fry in hot oil until translucent. Add chanterelles and thyme and fry well. Add 200 ml stock and cream. Bring to the boil and simmer for about 2 minutes. Bind with sauce thickener, season with salt and pepper. Arrange everything and garnish