In a medium bowl mix beef, pepper and 1/4 cup Mr. Yoshida's sauce. Shape into 4 patties.
Grill burgers to desired doneness. Grill pineapple slice. Baste burgers and pineapple rings during the last 1-2 minutes of grilling with remaining 1/4 cup sauce.
Place cheese on top of burgers; top with pineapple and serve on buns.