Soak the gelatine in cold water. Line a box mould (approx. 20 cm long; 800 ml content) with foil. Reduce the stock by half. Cool down. Dice salmon. Put 2 tbsp aside. Finely puree the rest and pass through a sieve
Stir the double cream and stock into the salmon puree. Puree everything again
Whip cream and egg whites separately until stiff. Squeeze out the gelatine, dissolve at low heat and stir in 2-3 tbsp. salmon cream. Then stir everything into the rest of the cream. Fold in the salmon cubes. First fold in cream, then beaten egg white. Smooth the mousse into the mould. Chill for at least 6 hours.
Turn the mousse over, remove the foil. Cut into cake pieces. Garnish with trout caviar, cress and whipped cream. Served with: brown bread