Combine tomatoes, onions, balsamic vinegar, salt, pepper, garlic and 1 tsp olive oil in a bowl and mix to combine. Add basil and gently toss. Give it a taste and add additional salt and pepper if necessary. Cover and chill. Slice baguette into half inch slices and place on a baking sheet.  Drizzle or brush some olive oil on top. Place in the oven for 8-10 minutes until just lightly toasted. Remove pan from oven. Slice garlic clove in half and rub cut side down on each piece of bread. Top with about a tablespoon of the tomato mixture. If desired, grate some fresh parmesan cheese on top and give it a quick toast in the oven.  Serve and Enjoy