Preheat grill or a cast iron skillet to high.
Divide the beef 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.
1/2 cup Dijon mustard
2 tablespoons prepared horseradish, drained
Whisk mustard and horseradish together in a small bowl.
2 Vidalia onions, sliced crosswise, 1/4-inch thick slices
2 tablespoons olive oil
Salt and freshly ground black pepper
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.
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