In small bowl, combine tomatoes, basil, balsamic, and salt. Stir to combine and allow to sit for at least five minutes.
To make grilled cheese, add thin layer of olive oil to the outside of both slices of your Martins Butter Bread. Place first slice, oil side down, on hot griddle. Add thin layer of cheese, only using half the amount. Add tomatoes and basil, allowing any residual liquid to remain in bowl. Top with cooked bacon. Cover with remaining mozzarella. Top with second piece of bread, oil side up.
Allow to cook over medium heat, flipping once, until dark golden brown and cheese has melted. Serve immediately.