Mix the crème fraîche with the horseradish sauce in a small bowl and set aside.
Butter the bread and cut off the crusts. Cut each slice into quarters.
Cut the salmon into small strips and sit a bite-sized piece on top of each of the squares of buttered bread.
When you're ready to serve, spoon a little of the sauce on top of each piece of salmon and top with fresh dill and black pepper.
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