When the beef is partially frozen, slice into 1/4-inch by 3-inch slices. Place in a zip-top bag. Pour the marinade over the beef, close the bag and turn it over a few times to make sure the beef is entirely coated.
Preheat grill over medium-high flame (you can also use a cast-iron grill pan on high heat for stovetop cooking). Place the pineapple slices on the grill and cook for 2 or 3 minutes a side or until just charred. Transfer to a serving platter.
Remove the steak from the marinade. Grill the pieces for a minute or two on each side, depending on how thin they are, until medium-rare to well done, your preference. You may need to work in batches. Transfer to a serving platter and garnish with the green onions. Serve immediately.
Nutrition information per serving:
Calories260Fat5 gSodium190 mg
Carbohydrates22 gSaturated fat2 gCalcium28mg