Peel the onion and cut into strips. Melt 1 tablespoon of clarified butter, add onion and braise for about 5 minutes. After 1 minute add sauerkraut. Wash the meat, pat dry and season with salt and pepper.
Heat 1 tablespoon of clarified butter in a frying pan. Fry the meat on each side for about 3 minutes. For the mashed potatoes boil 375 ml water with 1/2 teaspoon salt. Remove the pot from the heat and add milk.
Stir the puree flakes quickly into the liquid and let it swell for 1 minute. Remove meat from the pan and keep warm. Pour cream into the pan, bring to the boil and dissolve the meat. Add sauerkraut and 1 tablespoon of butter to the puree.
Arrange meat and mashed potatoes on plates. Spread the remaining butter on the steaks.