Fry the salmon in a pan with oil on both sides, remove immediately from the pan, place on a plate and let cool. Season with salt and pepper.
Peel shallots, cut into small cubes and fry in a pan with butter until golden. Mix together with the horseradish and breadcrumbs. Spread the mixture thinly on one side of the fish with a spoon. Bake them in a preheated oven at 180 ° C and top heat (max. 10 min.).
Clean and wash the lettuce and spin dry again. Make a vinaigrette from vinegar, oil, mustard and spices.
Wash the potatoes thoroughly, cut them into small cubes and bake them golden yellow in a pan with oil. Drain on a paper towel and season with salt.
Season the creme fraiche with the lime zest, salt, pepper and sugar.