To a mixing bowl, add ground beef, heavy cream, salt, and black pepper. Mix well with your hands. Divide into 6 equal sections. Each burger will be about 1/3 pound.
Use your thumbs to press a half dollar sized divot in the center of each patty (this will help prevent the burger from doming up while cooking).
Liberally rub coffee seasoning mix over both sides of each burger.
Preheat grill over MED HIGH heat and lightly brush grates with vegetable oil if desired. Grill burgers, for about 5 minutes per side, or until desired doneness is achieved.
While burgers are grilling, toast buns on the grill as well.
To serve, spread bbq sauce over the top and bottom buns, then top the bottom bun with a piece of lettuce, a cooked burger, a smear of more bbq sauce, some bacon, then top with the top bun.