For the vegetables, clean, wash and quarter the savoy cabbage and cut out the stalk. Cut cabbage into strips. Peel and chop onion. Heat 1 tbsp. oil. Sauté onion and cabbage for about 5 minutes at medium heat. Season with salt and pepper. Stir in 100 ml water and crème légère, bring to the boil, cover and stew for about 10 minutes.
For the fish in the meantime wash the salmon fillet, dab dry and cut into 8 pieces. Season with salt and pepper. Wash lemon hot, rub dry and cut into 8 thin slices. Put 1 lemon slice on each piece of salmon and tie it with kitchen string.
Heat 1 tablespoon of oil in a large frying pan, fry the salmon pieces in it first on the side without lemon for 3-4 minutes. Turn and fry for about 3 more minutes.
Peel, wash and finely grate the horseradish and stir into the savoy cabbage. Season vegetables again. Arrange everything.