Prepare Wagyu Beef: Dice the Wagyu rib cap, ensuring to cut through the intramuscular fat. Mince the diced beef thoroughly.
Shape Patties: Shape the minced beef into patties, seasoning with salt and pepper to taste.
Cook Patties: Cook the patties on a grill until they reach the desired level of doneness.
Build the Burger: Start with a brioche bun as the base. Layer with burger sauce, lettuce, pickled shallots, the cooked patty, bacon, and cheese sauce. Top with sour cream, fried onion rings, and a few more pickled shallots.