Take two slices of your favorite type of bread.
Toast the bread in a toaster until the bread is slightly brown.
Broadly spread mayonnaise on one slice of the toast.
Place three thin tomato slices, slightly overlapping, on the slice on which you spread the mayo. If you don't like tomatoes simply use ketchup.
Place a lot of large romaine lettuce leaves over the tomato slices.
Place few slices of ham over the lettuce.
Place a slice of your favorite cheese over the ham.
Slice the sandwich diagonally, and use sandwich toothpicks to hold the sandwich halves together.