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Make the crab paste: mix the ingredients together in a bowl and season, then set aside. In a separate bowl, mix the white meat with the herbs, lemon juice, oil and seasoning.
Spread the bread lightly with butter, then spoon and spread the crab paste over 4 of the slices. Pile the white meat over, then top with the remaining bread. Cut the crusts off, if you like, and serve halved or in small triangles or squares with lemon wedges on the side.