3 tablespoons good olive oil
1 small French bread or boule, cut into 1-inch cubes (6 cups)
1 teaspoon kosher salt
2 large, ripe tomatoes, cut into 1-inch cubes
1 hothouse cucumber, unpeeled, seeded, and sliced 1/2-inch thick
1 red bell pepper, seeded and cut into 1-inch cubes
1 yellow bell pepper, seeded and cut into 1-inch cubes
1/2 red onion, cut in 1/2 and thinly sliced
20 large basil leaves, coarsely chopped
3 tablespoons capers, drained
For the vinaigrette:
1 teaspoon finely minced garlic
1/2 teaspoon Dijon mustard
3 tablespoons Champagne vinegar
1/2 cup good olive oil
1/2 teaspoon kosher salt
1/4 teaspoon freshly ground black pepper