Cut the cucumber and crab sticks into bite-sized pieces.
Sprinkle a little salt on the cucumber and let it sit for a while.
Tear the crab sticks into small pieces.
Put the cucumber and crab sticks in a bowl and mix with mayonnaise and pepper.
Spread the prepared cucumber crab mayo salad on the bread slices.
Cover with another slice of bread and cut into easy-to-eat pieces.