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.
Use this paté as a base for a sandwich with crunchy cos lettuce, try it in a roulade or add a bowl of it to a cheese platter. The key is fresh, moist smoked fish. Keep it simple as I have done ...