Grilled Panzanella Salad

Name: Grilled Panzanella Salad
Ingredients: 3/4 of a loaf of day-old crusty, rustic bread, cut into 1-inch thick slices; 2 large tomatoes (about 1 lb.), trimmed and cut in half; 1 large red bell pepper, halved and seeded; 1 large green bell pepper, halved and seeded; 1 large red onion, sliced into large rings; 1/3 cup extra virgin olive oil; 1/4 cup red wine vinegar; 1 tablespoon capers, rinsed; 1/2 bunch (about 1/4 cup) fresh basil leaves, shredded; freshly cracked black pepper and kosher salt, to taste