Season pork belly with paprika, salt, and pepper. Tightly wrap pork twice in heavy-duty aluminum foil. Place on a baking sheet and bake in the preheated oven for 2 1/2 hours. Turn off the oven; let pork rest in the oven for 1 hour. Remove meat from oven, leaving it wrapped in aluminum foil, and refrigerate at least 8 hours or overnight.
Remove pork from foil and slice across the grain in 1/4-inch thick slices. Working in batches, cook pork in a non-stick skillet over medium heat until golden and crisped, 6 to 8 minutes per slice.