There was no real recipe source for this dish since it's something I just happened to do for a quick snack. It then became something I saw at summer parties. And if you're in a crunch to serve up something vegetarian friendly, this would be a perfect choice! I found this dish to be wonderful in the summer so that we could take advantage of the tomatoes in season.
If you wanted to make it a bit more hearty, try adding some slices of proscuitto ham or even thinly sliced sopressata sausage! If you do choose to serve this up at a party, I would hold off drizzling the balsamic until just before serving so the bread doesn't get too soggy. And if you're not a fan of balsamic vinegar (who isn't?!), pesto is a nice option too!
6 dinner rolls,split
6 slices of fresh tomatoes (in season is best!)
6 slices of fresh mozzarella
6-12 fresh basil leaves
2 tablesspon balsamic vinegar or 2 tablespoons pesto
On the bottom half of each roll, top with a tomato slice, slice of mozzarella and 1-2 fresh basil leaves.
Just before serving, drizzle balsamic vinegar or pesto.