Place cubes of bread in a large bowl and drizzle with 2 tablespoons of olive oil. Lightly salt and toss everything together to coat bread. Place in oven and bake at 350 degree F for 5-10 minutes, or until lightly toasted.
In a large bowl add tomatoes and lightly salt.
Add cucumbers, onions, basil, and bread.
Whisk together olive oil and vinegar. Drizzle over salad and toss to coat.