Ingredients
GRILLED VIDALIA ONIONS:
- 1 Vidalia onion, sliced crosswise 1/2-inch thick (do not separate into rings)
- Olive oil, for brushing
- Kosher salt and freshly ground black pepper
Directions
Preheat a gas or charcoal grill to high.
Brush onions with olive oil on both sides and season with salt and pepper. Grill until golden brown, 3 to 4 minutes on each side.
HORSERADISH MUSTARD:
- 1/2 cup Dijon mustard
- 1 tablespoon finely grated fresh horseradish, or prepared horseradish, drained
Mix the mustard and horseradish together in a small bowl.
May be refrigerated up to 1 week; serve at room temperature.
Yield: 1 cup
HAMBURGERS:
- 11/4 pounds freshly ground chuck (slightly coarse grind)
- Kosher salt and freshly ground pepper
- 8 (1/4-inch-thick) slices Cheddar cheese
- 4 hamburger buns
- 4 leaves romaine lettuce
- Grilled Vidalia onions, recipe above
- 4 (1/4-inch-thick) slices beefsteak tomatoes (2 tomatoes)
- Horseradish Mustard, recipe above
Divide the chuck into 4 (5-ounce) burgers and season on both sides with salt and pepper (handle as little as possible and form the burgers loosely). On the preheated grill, cook 3 to 4 minutes on each side for medium rare.
During the last minutes of cooking, top each burger with 2 slices of cheese, cover the grill, and let the cheese melt, about 1 minute. Split the buns and toast on the grill, cut side down, until golden.
Place a burger on each bun and top with lettuce, onions, tomato, and a dollop of Horseradish Mustard. Arrange on a large platter.

















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By dragline06_13043200
San Antonio
on August 11, 2010
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First off, I love the Horseradish Mustard! I put a little different spin on this burger with some leftovers from another one of Bobby's great recipes (Grilled Chicken Cordon Bleu. right before putting the cheese on, I put a peice of proscuitto on the burger for about 45 seconds then the cheese (I substituted Pepper Jack cheese for Cheddar. I also used Arugula instead of Romaine lettuce! Tasty burger!!
By harpstrings12
Staten Island, NY
on March 24, 2010
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This recipe is one of the best I've tried for hamburgers..they are HUGE and look really great on the plate. The grilled onions and the horseradish mustard really make this dish so don't leave any of it out! My boyfriends favorite food is a hamburger and this is one of the first things I cooked for him, and he loved it! I think he looked at me differently after that meal! haha
By playfulxqutie_9...
Perris, CA
on February 16, 2010
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So I really don't know how much my review will help. Only because I didn't have all the ingrediants handy, I was only able to use the cheddar cheese and the Horseradish Mustand. This burger was so darn good!!! I used onion buns, toasted, and regular frozen patties w/ seasoning and the Horseradish Mustard. All 6 members of the family LOVED it. My kids are already asking for it again for dinner!
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