Drain chanterelles well. Clean, wash and quarter the savoy cabbage and cut out the stalk. Cut cabbage into fine strips. Peel and finely chop the onion.
Heat clarified butter in a large pot. Steam onion and savoy cabbage for 3-4 minutes while turning. Season with salt and pepper. Add cream, bring to the boil and braise for another 10 minutes.
Fold in the chanterelles. Cover and simmer for about 5 minutes. Season to taste with salt, pepper and nutmeg.