Wash the fish, dab dry, sprinkle with lemon juice and season with salt and pepper. Cover the fish fillet with North Sea crabs. Stir crème fraîche with vodka, salt and pepper until smooth and spread on the crabs. Wash the dill, pluck flags from the stalk and chop. Sprinkle the fish on top. Cook in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 15-20 minutes