Make the BBQ sauce. Combine the barbecue sauce, pineapple juice, garlic, salt, and black pepper in a bowl and whisk until thoroughly incorporated.
Season the pork, fruit, and veggies. Combine the cut up pork, pineapples, peppers, and onions in a mixing bowl; season with adobo seasoning, salt, and pepper, and toss to combine.
Prepare the pork kabobs. Thread the pork onto skewers, alternating with onions, pineapples, and peppers. Reserve 1/2 cup of the prepared barbecue sauce for serving; brush the skewers with the remaining barbecue sauce.
Cook. Grill the pork skewers for 8 to 10 minutes, turning occasionally, or until the pork is thoroughly cooked and the vegetables are tender and charred. Por is done when its internal temperature registers at 145˚F.
Finish and serve. Transfer the pork kabobs to a platter and brush them lightly with some of the reserved barbecue sauce. Serve them with the remaining barbecue sauce on the side.
Notes
To Store: Cover tightly with plastic or place in an airtight container in the fridge for 2-3 days or freeze for up to 2 months.
To Reheat: Wrap in foil and warm them in the oven at 300°F for 15-20 minutes, or until warmed through.