Ok, so basically you open up the bun and drizzle ketchup and mustard on one side of the meat and cover with 2 onion layers, then put the bun on top, flip it over and take off the bottom bun. Put barbecue sauce in the meat and cover with lettuce, then put the bun on, flip and enjoy
i like mine with cheese on one side, honey mustard, tomato and lettuce on the other. possibly with grilled onions (and jalapenos).