The refreshing crunch of cucumber and a dollop of cooling yoghurt are the ideal foils for the rich, smokey fish.
Flake the mackerel fillets into the bowl of a food processor. Add the yoghurt, horseradish and lemon juice and season with salt and freshly ground black pepper. Pulse gently to a rough paste.
Butter the bread, remove the crusts and cut into neat squares.
Arrange a single layer of sliced cucumber onto half of the buttered bread. Spread the mackerel pâté on top and sandwich with the remaining bread.
To serve, cut the sandwiches into triangles.
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