Preheat oven to 375°F.
Bake bacon on a slotted pan in the center of the oven until crispy. Cut into 2-inch jumbo bacon bits.
In a small bowl, combine sour cream, ketchup, relish, Worcestershire and hot sauce. Season with salt and pepper to taste.
Split the rolls and toast them lightly.
Season meat with salt and pepper, and grate 3 tablespoons of onion over the meat. Form 4 thin, wide patties. Finely chop the remainder of the onion and rinse with water; reserve.
Heat a cast-iron skillet over medium-high heat with half a tablespoon of oil, a half turn of the pan. Cook patties 5-6 minutes turning once; melt 2 slices cheese over each patty.
Assemble burgers by layering bun bottoms with lettuce, pickles, a cheeseburger, bacon bits, chopped onions, sauce and bun tops.