Season the pork belly slices on all sides with BBQ seasoning.
Place in your smoker or pellet grill set to 250 degrees for 3 hours, flipping halfway through. Or place on a lined baking sheet in a 250 degree oven for 3 hours, flipping halfway through.
Preheat your griddle to medium high. Add cooking oil of choice and cook the pork belly slices 1 1/2 to 2 minutes per side. Brush with BBQ sauce during the last 45 seconds.