Incise the skin of the pork belly in a diamond shape.
For the marinade, press through the garlic cloves, then mix all the ingredients thoroughly. Put the marinade and the belly in a freezer bag (3 liters) and place in the refrigerator for 24 hours. Turn occasionally.
Preheat the oven to 180 top / bottom heat. Line the drip pan with parchment paper. Place the belly skin side down on the wire rack. Fry for 1 hour, then turn (skin side up) and fry again for 1 hour. Brush the belly with the marinade while it is cooking.
Tip: I put the potato slices and onion wedges on the baking paper. Makes a great side dish.