Grilled Italian Panini with Zucchini, Summer Squash & Basil Recipe

INGREDIENTS

• 1 medium zucchini
• 1 medium yellow squash
• 2 red bell peppers, quartered
• 1 tbsp olive oil
• 2 tsp balsamic vinegar
• 1/2 tsp kosher salt
• 1/2 tsp freshly ground pepper
• 4 whole wheat ciabatta rolls, cut in half crosswise
• 1/2 cup tomato sauce (your favorite kind)
• 4 oz. fresh mozzarella, thinly sliced
• 8 fresh basil leaves, thinly sliced