Summer Antipasto Burger with Balsamic Vinaigrette - Sutter Home Family Vineyards

Ingredients

• 2 pounds ground chuck
• 1/4 cup minced onion
• 2 teaspoons balsamic vinaigrette
• Vegetable oil, for brushing on the grill rack
• 6 slices fresh mozzarella cheese
• 6 ciabatta rolls – sliced in half horizontally
• Balsamic vinaigrette, for brushing rolls and drizzling
• 12 slices genoa salami
• 6 leaves romaine lettuce
• 12 slices tomato