Clean and wash the peppers and spring onions and cut them into larger pieces. Rinse crabs cold and drain. Peel and wash potatoes, cut them in half lengthwise and cut them into slices. Heat the oil in a large pan. Fry the potatoes over medium heat for 15 minutes until golden brown, turning constantly. Add paprika and cook for about 10 minutes.
Add spring onions and shrimps 5 minutes before the end of the cooking time. Season vegetables with salt and pepper. Mix crème fraîche and horseradish. Serve the vegetables with crème fraîche stains in the pan. Sprinkle with chopped parsley