Cook the bacon in a large frying pan, reserving the fat.
Rip up 1 slice of the white sharp cheddar and 1 slice of the yellow sharp cheddar and fold into the middle of each burger. Form 4 patties around the cheese. Season the beef with the salt and pepper.
Cook the patties in the bacon fat. Before they finish, melt a slice of the horseradish cheddar and a slice of the yellow mild cheddar on each burger. Cover the pan or tent to help the cheese melt.
BUILD YOUR BURGER: Bottom bun, lettuce, cheeseburger, bacon slices, onions, top bun. A gratuitous number of cheddars? No. Five would be crazy. But what are you going to do, three? No. Four's your number.
"The Bob's Burgers Burger Book: Real Recipes for Joke Burgers" by Loren Bouchard, The Writers of Bob's Burgers and Cole Bowden (c) Universe Publishing/ Rizzoli New York 2016. Reprinted with permission from Universe Publishing / Rizzoli New York. All