Peel, wash and halve the potatoes and cook in boiling salted water for about 20 minutes. For the sauce, peel shallots and garlic. Cut the shallots into cubes. Press garlic through a garlic press.
Heat 1 tablespoon of butter. Sauté shallots, garlic and almonds while turning. Deglaze with Calvados. Stir in crème fraiche and cream. Add the capers. Season to taste with salt and pepper. Keep sauce warm.
Fish clean, wash. Heat 2 tablespoons of butter in 2 frying pans. Fry sole in portions on each side for about 4 minutes. Wash parsley, shake dry, pluck the leaves from the stalks and chop.
Take the fish out of the pan and fillet it. Arrange potatoes, fish fillets and sauce on plates. Sprinkle with parsley and garnish.