Wuxi Pork with Wine Sauce

Ingredients

1 (2-lb) piece fresh pork belly (unsmoked bacon) with skin and bones

2 (32-oz) bottles club soda

1 tablespoon vegetable oil

4 garlic cloves

3 (1- by 1/4-inch) slices fresh ginger, smashed with flat side of a heavy knife

3 scallions, trimmed and smashed

2 cups Chinese white rice wine, Chinese white rice cooking wine, or Japanese sake*

3 whole star anise

2 whole cloves

1 (2- by 2-inch) piece dried tangerine peel*

1/2 cup plus 3 tablespoons Chinese sweet red rice wine, Chinese sweet red rice cooking wine, or medium-dry Sherry*

2 to 3 tablespoons dark soy sauce (also known as superior)*

1 tablespoon cornstarch