Put the potatoes, eggs, flour, baking powder, salt and pepper in a food processor. Pulse 4-5 times to blend, and then gradually add enough of the milk to make a thick, smooth batter.
Heat a large skillet over medium-high heat. Brush the pan with butter. Drop spoonsful of the batter into the pan and cook for 2-3 minutes on each side, or until browned and heated through. Repeat with additional butter and remaining batter. The cakes can be served immediately or refrigerated, covered, overnight; reheat them in a preheated oven.
To serve, put a spoonful of sour cream or crème fraîche on top of each pancake. Put a piece of rolled salmon on top, sprinkle with pepper, and garnish with chives.

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