The Mesa Grill Burger Recipe

• 1/4 cup Dijon mustard
• 1 tablespoon prepared horseradish, drained
• 1 large Vidalia onion, sliced crosswise into 1/2-inch-thick slices
• 2 tablespoons canola oil
• Kosher salt and freshly ground black pepper
• 2 pounds ground chuck
• 8 slices Cheddar cheese (each 1/4 inch thick), preferably a mix of white and yellow
• 4 sesame seed hamburger buns
• 4 slices beefsteak tomato
• 4 lettuce leaves

1. Whisk together the mustard and horseradish in a small bowl; set aside.
2. Preheat the grill to high or a grill pan over high heat.
3. Brush the onion slices with the oil on both sides and season with salt and pepper. Grill the onion slices for 3 to 4 minutes on each side, until lightly golden brown.
4. While the onion is grilling, form the meat into 4 burgers. Season the burgers on both sides with salt and pepper. Grill for 3 to 4 minutes on each side for medium. Add 2 slices of the cheese to the top of each burger, cover the grill, and let melt, about 1 minute.
5. Place the burgers on the buns sandwiched with onion, tomato, lettuce, and a dollop of horseradish mustard.

dijon mustard, horseradish, vidalia onion, canola oil, kosher salt, ground chuck, cheddar cheese, sesame seed hamburger, tomato

Taken from www.seriouseats.com/recipes/2009/01/the-bobby-flay-mesa-grill-burger-recipe.html (may not work)