Wash and chop the tomatoes into bite-sized pieces.
Dice the cucumber and chop the bell pepper.
Thinly slice the red onion.
Tear or cut the stale bread into cubes.
In a large bowl, combine the chopped tomatoes, cucumber, bell pepper, and onion.
Add the bread cubes to the vegetable mixture.
In a separate bowl, whisk together olive oil and red wine vinegar.
Pour the dressing over the salad and toss gently to combine.
Season with salt and pepper to taste.
Garnish with fresh basil leaves before serving.