For Pimento Cheese:
- Fire up the grill. Form the meat into a patty and season liberally with salt and pepper. Sear the burger on each side over hottest part of grill then move it to indirect heat. After about 2 minutes on each side, or when patty is medium rare, spread about an 1½ ounces pimento cheese on top and put it in broiler.
- While burger is finishing in broiler, brush bun with a little melted butter and toast on indirect heat. By the time the cheese is melted, the patty should be a perfect medium.
- To assemble, spread 1 tablespoon mustard on the bottom half of bun. Add lettuce, onion, and tomato, and top with burger, bacon, and top of bun.
Combine cheeses, mayonnaise, onion, shallot, and peppers, then fold in all the remaining ingredients. Recipe yields one quart.