Both my parents were from Wales and we had these often, best when the cukes came from our own garden. 2 slices thinly sliced bread, crusts removed, butter each slice, cover 1 slice with thinly slices cukes (overlapping), little S&P, put the lid on and slice criss-cross. YUM. Butter is best (not margarine). Sometimes it was a cheese sandwich done the same way.