In a large bowl combine the tomatoes, red onion, basil, olive oil, garlic and season liberally with salt and pepper.
Let the tomato mixture sit room temperature for about 20 minutes to let the flavors blend (the juices from the tomatoes will release and create a kind of dressing). Toss well.
When ready to serve, toss the tomato mixture and divide in 4 bowls. Eat with crusty bread if desired.