Wash and dry tomatoes then slice and put into a bowl. Remove any hard parts and the stem.
Peel and thinly slice red onion. Add to the tomatoes.
Prepare salad dressing: combine 3 tbs olive oil and 2 tbs white balsamic vinegar. Peel and thinly slice or grate garlic cloves and add to the oil and vinegar. Add salt and pepper to taste and combine well with a fork or a whisk. Pour dressing on top of salad.
Cut stale bread into slices or chunks. Add to the salad and combine well. Let rest for about 5 minutes, to let the bread soak up juices, then serve, topped with a couple fresh basil leaves.