2.Cut one-third of salmon into fine strips and set aside. Place remaining salmon in a food processor with crème fraîche, butter and lemon rind. Pulse to coarsely chop. Transfer to a bowl. Mix in green onion, chives and lemon juice.
3.Spoon reserved salmon into bases of prepared ramekins. Top with crème fraîche mixture, pressing down lightly to remove any air pockets. Smooth surface, cover with plastic wrap and refrigerate 1 hour, until ready to serve.
4.Top rillettes with cucumber. Run a knife around inside edge of each ramekin to release rillettes from sides. Invert onto serving plates and top with extra chives. Serve with melba toast.