Prepare sauce by placing BBQ sauce in a bowl and adding 2 Tbsp of the pineapple juice. Stir together and set aside.
Grill patties according to the directions on the box. Add cheese slices and allow to melt before removing from the grill.
Spread 1 Tbsp sauce on the bottom part of each of the four buns. Cover with 1/4 c. lettuce and a patty. Break two bacon slices in half and set on top of patty. Then top with pineapple ring. Spread 1 Tbsp sauce on the inside of the top bun and top the burger. Enjoy!