Preheat broiler.
Place tomato slices on top of bread. For the size of my bread, two slices of tomato fit on each piece of bread.
Top with mozzarella. Again, this is going to depend on your preference of cheesiness and size of your bread. I put 2-3 slices of mozzarella on each piece of bread.
Place bread onto baking sheet.
Place under broiler for 1-2 minutes, until cheese is melted and starting to bubble.
Top with chopped basil, drizzle with balsamic reduction, and sprinkle with sea salt.
Enjoy!
*To make balsamic reduction:
Place balsamic vinegar and sugar into small saucepan.
Bring to a simmer over medium-high heat.
Lower heat to low and let simmer for 10-15 minutes, until vinegar is thickened to the consistency of maple syrup. A good way to tell is that it will coat the back of a spoon.