Cut the slices of bread in half lengthwise. Heat 2 tablespoons of oil in a frying pan. Fry 2 slices of bread for about 4 minutes while turning. Place on kitchen roll. Repeat the process with the rest of the bread.
Peel and finely grate the horseradish. Wash dill, shake dry, pluck dill tips from the stalks and cut finely. Mix dill and half of the horseradish and season with salt, pepper and 1 tablespoon of lemon juice.
Mix the crème fraîche with the rest of the horseradish and season to taste with salt, pepper and 1 teaspoon of lemon juice. Cut the fish into approx. 1 x 1 x 4 cm strips. Spread breads 3/4 with horseradish cream, cover with salmon strips and sprinkle with Gremolata.