Grilled Farmers’ Market Sandwich - Martin's Famous Potato Rolls and Bread

Ingredients

• 2 Tablespoons Olive Oil, divided
• 8 Slices Eggplant, ½" thick
• 2 Slices Red Onion, ½" thick
• 1 Large Zucchini, cut lengthwise into 4 pieces
• 2 Teaspoons Fresh Rosemary, chopped
• 1/4 Teaspoon Black Pepper
• 1/8 Teaspoon Salt
• 1 Tablespoon White Balsamic Vinegar
• 8 Slices Martin’s Potato Bread
• Cooking Spray
• 4 Slices Provolone Cheese, halved
• 8 Slices Tomato, ¼” thick
• 8 Basil Leaves