Mix all the ingredients for the marinade. Brush the pork belly on all sides with the marinade and place in a baking dish or bowl. Refrigerate for 5-8 hours.
Preheat the oven to 250 F. Clean the belly of any remaining marinade. Place it in a baking dish and fill it with pure olive oil. Cover the baking dish with foil and bake the pork belly for 3 hours. Let the pork confit cool, then cut into pieces and serve.