Grilled Panzanella Salad

Ingredients

• 1/4 cup extra-virgin olive oil, plus more for brushing
• 2 3/4″-thick slices country bread
• 1 medium zucchini or summer squash, halved
• 1/2 large red onion, cut into 4 wedges
• Kosher salt
• Freshly ground black pepper
• 1 clove garlic, minced
• 2 tbsp red wine vinegar
• 4 cups diced mixed tomatoes (such as heirloom, vine-ripened, cherry, and grape)
• 1 cup cubed fresh mozzarella
• 1 small peach or plum, cut into wedges
• 1/2 cup packed fresh basil leaves, torn into bite-size pieces
• Balsamic glaze, for drizzling, optional