Ingredients
1/4 cup mayonnaise1/4 cup prepared pesto, divided3 ounces sliced pancetta, finely chopped1/4 teaspoon pepper1/8 teaspoon kosher salt1 pound ground beef1 small red onion, cut into 4 slices1 large tomato, cut into 4 slices1 tablespoon olive oil8 ounces fresh mozzarella cheese, cut into 4 slices4 Italian rolls, split1 cup fresh arugula or fresh baby spinach
Preparation
In a small bowl, combine mayonnaise and 2 tablespoons pesto; cover and chill until serving. In a large bowl, combine the pancetta, pepper, salt and remaining pesto. Crumble beef over mixture and mix well. Shape into four patties.
Brush onion and tomato slices with oil. Grill onion over medium heat for 4-6 minutes on each side or until crisp-tender. Grill tomato for 1-2 minutes on each side or until lightly browned.
Grill burgers, covered, over medium heat for 5-7 minutes on each side or until a thermometer reads 160° and juices run clear.
Top burgers with mozzarella cheese. Grill 1 minute longer or until cheese is melted. Spread cut sides of rolls with pesto mayonnaise; top with burgers, onion, tomato and arugula.
