Hi
Over here in the UK we normally do the following.
Use a good White Loaf sliced, peel the cucumber first the thinly slice.
Use a good quality butter not spread and put the cucumber on the buttered bread, sprinkle malt vingar on the cucumber and place top butter slice on.
Cut into triangles and cut of the crusts.
hey presto cucumber sandwiches, but really us british do not eat them lol
Loulou1972