Preheat grill to medium.

Combine ground beef, salt and 2 tablespoons of your favorite bbq sauce.

Shape into 4 patties, and flatten to roughly the same size of your buns (they will shrink some during cooking).  Place burgers on the grill and cook for a few minutes on each side, until the internal temperature registers 160 degrees.

 When you flip the burgers, add the pineapple slices to the grill, making sure you get a chance to flip them once as well.  They should be tender and have some char marks on them. 1-2 minutes on each side should be sufficient.

If desired, toast your buns. Spread mayo on each side, or what I did in my photos is a 50/50 mix of mayo and bbq sauce.

Place burgers in buns, top with the slice of pineapple, top with 1-2 slices bacon, and an extra drizzle of barbecue sauce.