Beat the schnitzel flat. Season with a little salt and pepper on both sides. Dust with flour thinly.
Heat the clarified butter and fry the meat on both sides for 4 minutes until golden brown. Take out and keep warm.
Loosen the frying stock with white wine. Let the sauce boil down for a few minutes. Stir in the cream and crème fraîche. Put the schnitzel back in. Season to taste with lemon pepper and sugar. Serve sprinkled with parsley.