Rinse out two small moulds (each with a capacity of 200 ml) or one mould (approx. 1⁄2 l capacity), line with foil. Wash the shrimps, dab dry. Fry in hot oil for 2-3 minutes. Season with salt and pepper.
Take out, let it cool down.
Soak the gelatine in cold water. Cut the trout into small pieces. Finely puree with crème fraîche. Wash the dill and put something aside for garnishing. Finely chop the rest. Wash the lemon and grate the peel. Cut the prawns into small pieces.
Squeeze out the gelatine and dissolve over a mild heat. First stir in some trout cream, then stir in the rest of the trout cream. Whip the cream until stiff. Add dill and lemon zest. Season to taste, fold in the prawns.
Fill into the moulds and smooth down. Chill for at least 4 hours. Remove the mousse from the mould, remove the foil. Garnish with lemon, salmon florets and dill.