Fontina Cheeseburgers with Lemon-Herb Mayonnaise | Red Meat Recipes | Weber JP

Ingredients

• 240 milliliters mayonnaise
• finely chopped fresh chives
• finely chopped fresh Italian parsley leaves
• finely chopped fresh thyme leaves
• garlic cloves, minced
• freshly grated lemon zest
• fresh lemon juice
• 680 grams ground chuck (80% lean)
• kosher salt
• freshly ground black pepper
• large yellow onion, cut crosswise into four slices about 12 millimeters thick
• extra-virgin olive oil, divided
• 140 grams Fontina cheese, thinly sliced
• Hawaiian sweet sandwich buns, or other soft sandwich buns, split
• large leaves butter lettuce