Thaw peas at room temperature. Heat 1 tsp. oil and roast pine nuts while turning. Peel onion and cut into cubes. Heat 1 tsp. oil and fry onion until translucent. Add the peas and fry briefly.
Add the stock and wine, bring to the boil and, except for 2 tbsp. peas, finely chop with a blender. Stir in crème fraiche. Wash the dill, shake dry, pluck flags from the stalks and chop finely except for a little garnish.
Spread 1 teaspoon of horseradish on each of the salmon slices, roll up and cut into slices. Arrange soup in plates, sprinkle with dill, peas and pine nuts. Spread the salmon slices over the soup.