Add 1/4 cup of teriyaki sauce (see recipe link above) to the meat along with the chopped green onions and hand mix
Form 3 patties
Slice pineapple for grill
Grill burgers over medium heat about 5 minutes per side for medium-well (grill temperatures and times may vary - check for doneness according to your taste)
Grill pineapple alongside burgers, turning frequently, heat 2 or 3 minutes per side for grill marks
Serve burgers and pineapple with extra teriyaki sauce on the side