Spread Mayonnaise,tomato ketchup,mustartd sauce on both the slices of bread. Arrange sliced cucumber on one slice of bread and sprinkle salt and pepper. Cover with the other slice of bread. Your Cucumber Sandwich is ready..... :)
You can cut the bread using a cookie cutter to give it a shape and make it more interesting for kids. if you are making it for kids you can grate the cucumber or chop it, so that it's easy for them to eat.