For the sauce: In a small bowl combine the creme fraiche, herbs, lemon zest and juice, salt, and pepper.
Assemble the canapes: Dab a teaspoon or of creme fraiche sauce on 1 side of the pumpernickel slices. Place 1 or 2 large flakes or chunks of trout on each, and top with a small dollop of crème fraiche sauce. Garnish each canape with a frond of dill, and serve.
Recipe courtesy of Rachel Ray