Peel and wash the potatoes, cover and cook in a little salted water for about 20 minutes
Peel or clean and wash the vegetables. Cut or slice everything into fine strips. Cook in approx. 1/8 l boiling water covered with broth for 2-3 minutes
Fry the steak in a coated pan in hot oil for 2-3 minutes on each side. Season with salt and pepper. Take out and wrap in aluminium foil
Drain the vegetables and collect the broth. Sweat flour in hot frying fat. Stir in stock, bring to the boil and simmer briefly. Add mustard, cream and capers. Season sauce with salt, pepper and lemon juice. Arrange and garnish everything
Do you still have low-fat cream cheese in the fridge? Then you don't need to buy extra sour cream, the sauce will also work with it