Bobby Flay'S Hamburger With Double Cheddar Cheese - cooking recipe

Ingredients

2 lbs freshly ground chuck
salt & freshly ground black pepper
8 slices white cheddar cheese, sliced 1/4-inch thick
8 slices yellow cheddar cheese, sliced 1/4-inch thick
8 perfect hamburger buns
8 leaves romaine lettuce
dill pickle, sliced
ketchup
HORESERADISH MUSTARD
1/2 cup Dijon mustard
2 tablespoons prepared horseradish, drained
GRILLED VIDALIA ONIONS
2 vidalia onions, sliced crosswise, 1/4-inch thick slices
2 tablespoons olive oil
salt & freshly ground black pepper

Preparation

Preheat grill or a cast iron skillet to high.
Divide the sirloin into 8(4-ounce) burgers.
Season on both sides with salt and pepper, to taste.
Grill or cook in the skillet for 3 to 4 minutes on each side for medium-rare doneness.
During last minutes of cooking add 2 slices of cheese to each burger, cover grill and let melt, approximately 1 minute.
Place burger on bun and top with Horseradish Mustard, lettuce, Grilled Vidalia Onions, pickles and ketchup.
HORESERADISH MUSTARD: Whisk mustard and horseradish together in a small bowl.
GRILLED VIDALIA ONIONS: Brush olive oil on both sides of the onions and season with salt and pepper. Grill the onion slices for 3 to 4 minutes on each side until golden brown.