Dump the garlic, tomatoes with their seeds and juice, basil, olives, balsamic vinegar, olive oil and some salt and pepper into a mixing bowl. Stir it up and let it sit until ready to serve.
Heat a grill pan over high heat. Brush both sides of the bread slices with some olive oil and grill until grill marks form, about 2 minutes; flip and grill on the other side, another 2 to 3 minutes. Arrange the bread on a serving platter and mound a heaping tablespoon of bruschetta mixture on top of each piece. Put any remaining tomato mixture in a small serving bowl and serve with the bruschetta.
Adapted from "One Dish at a Time: Delicious Recipes from My Italian-American Childhood and Beyond" by Valerie Bertinelli © Rodale 2012. Provided courtesy of Valerie Bertinelli. All rights reserved.