BLT Bread Salad

Name: BLT Bread Salad
Ingredients: 1/4 cup thinly sliced red onion; 6 ounces thinly sliced pancetta; 1/4 cup extra-virgin olive oil; 1/2 loaf crusty Italian bread, cut into 1-inch cubes (about 5 cups); Kosher salt and freshly ground pepper; 2 pounds mixed heirloom tomatoes, cut into 1 1/4-inch chunks; 3 cups baby arugula; 1 cup fresh basil leaves, roughly chopped; 1/4 cup pitted kalamata olives, chopped; 2 tablespoons red wine vinegar; 2 ounces ricotta salata cheese, shaved