Slice the short rib into thin pieces.
Add the short rib to a bag.
Add the pineapple juice, bbq rub and bbq sauce to the bag and seal it.
Give it a good mix and shake, making sure each piece is cover in marinade.
Place the bag in the fridge for 1-2 hours.
Fire up your grill to a high searing temp.
Sear off the short rib pieces for 1-2 minutes each side.
Let rest for a couple minutes and enjoy!