Caramelized Onion & Prosciutto Crumble Burger

Ingredients

• 1 pound ground hamburger
• ½ cup cola
• 1 tablespoon garlic
• 1 teaspoon salt
• 1 teaspoon pepper
• 1 tablespoon olive oil
• 1 tablespoon butter
• 1 medium yellow onion, cut into thin slices
• ¼ teaspoon sugar (optional)
• ¼ pound prosciutto sliced ultra-thin (at the deli counter) and cut in half lengthwise
• 4 onion hamburger buns
• ¼ pound DI LUSSO® Wisconsin Sharp Cheddar Cheese , sliced ¼ inch thick (at the deli counter) and shredded
• 1 cup arugula