Drain the sauerkraut. Dab fillets dry. Fry in hot oil for 2-3 minutes on each side. Season with salt and pepper.
For the puree, boil 1/2 l water and 1/2 teaspoon salt. Take the pot from the stove and stir in the puree flakes. Fold in 1 tablespoon truffle butter and sauerkraut. Cover and leave to stand so that the cabbage gets warm.
Wrap the steaks in foil and let them rest for a short time. Deglaze the meat with 5-6 tablespoons of water and cream. Simmer for 2-3 minutes. Season with salt and pepper.
Stir the puree again and season to taste. Arrange everything. Spread the rest of the truffle butter on the steaks.