You need: 2 slices of Italian bread, mayo, lettuce, tomato, cheese, lunch meat, salt, pepper, and onion (optional).
Toast two slices of Italian bread
Put mayo on both slices of the bread
Now put on lettuce, tomatoes, and onion (if you wanted some)
Next is the cheese of your choice (John likes American Cheese for Barbie Sandwiches) and the lunch meat: ham, turkey, etc. Then the salt and pepper and... Enjoy! ;)