Mix together pineapple juice, soy sauce, sugar, ginger, garlic, and onion powder in a small bowl or container. Stir in cilantro.
Pour marinade over pork in resealable bag. Refrigerate at least 1 hour or overnight.
Prepare grill to medium-high heat. Drain marinade from pork and discard. Grill pork about 2-4 minutes per side or until desired doneness. Let pork rest a few minutes before serving.
SNAPPY TIPS: Be sure to let the pork rest after cooking so that the juices can settle in. Use salt and pepper to taste. The recipe for the marinade makes about 1 cup. If you would like more, double the recipe.SNAPPY SUBSTITUTIONS: Instead of ground ginger and garlic powder you can use a little fresh ginger and garlic. Other cuts of pork would work well too such as pork chops or pork tenderloin.