GZ's Iron Chef Burger

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1 1/2 pounds ground beef (equal mix of ground brisket, chuck and rib-eye)

Kosher salt and freshly ground black pepper 

1 small sweet onion, sliced into thin rings 

8 slices Cheddar

4 tablespoons butter, at room temperature

4 English muffins, split

2 tablespoons Dijon mustard 

2 tablespoons mayonnaise 

2 tablespoons ketchup 

2 tablespoons prepared horseradish 

2 tablespoons finely diced gherkins 

1 tablespoon sliced chives 

12 dill pickle slices, if desired 

8 Gem lettuce leaves, cut to the size of the English muffins