Hamburger with Double Cheddar Cheese, Grilled Vidalia Onion and Horseradish Mustard

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2 pounds freshly ground chuck

Salt and freshly ground black pepper

8 slices white Cheddar, sliced 1/4-inch thick

8 slices yellow Cheddar, sliced 1/4-inch thick

8 hamburger buns

Horseradish Mustard, recipe follows

8 leaves Romaine Lettuce

Grilled Vidalia Onions, recipe follows

Dill pickles, sliced

Ketchup

Horseradish 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 and freshly ground black pepper