Grilled Caprese Sandwich

slices sliced Italian bread (, French bread, or sourdough bread)

slices of a fresh mozzarella cheese (, about 1/4 inch thick (you can find fresh mozzarella balls in your speciality cheese section of your grocery store))

slices of tomato (, about 1/4 inch thick)

basil leaves

basil pesto

olive oil or butter

salt and pepper

balsamic vinegar