Wash the potatoes and cook in boiling water for about 20 minutes. In the meantime cut the peppers in half, clean, wash and cut into fine cubes. Wash parsley, shake dry and chop finely. Cut cress from the bed.
Stir the quark with milk, sugar and lemon juice until smooth. Season to taste with salt and pepper. Stir in parsley and about half of the cress. Cover and put in a cool place.
Dab steaks dry and season with salt. Heat 2 tablespoons of oil in a frying pan. Sauté the steaks in it for 2-3 minutes on each side. Season with pepper. Wrap steaks in foil and bake in a preheated oven (electric cooker: 100 °C/ convection oven: 75 °C/ gas: see
manufacturer) for about 10 minutes. Peel onions, cut them into fine rings and turn them in flour. Heat 50 ml oil in a frying pan. Tap the excess flour off the onions. Fry onion rings in hot oil in portions until golden brown.
Drain on kitchen paper.
Drain the potatoes, rinse with cold water and peel. Arrange on plates with some curd cheese, steaks and fried onions. Sprinkle with remaining cress and coloured pepper. Add the remaining curd cheese.