Whisk 2 chopped garlic cloves, 1 tbsp grated ginger, 1 tbsp malt vinegar, 50 ml (2 fl oz) shaoxing rice wine, 50 ml (2 fl oz) hoisin sauce, 50 ml (2 fl oz) Chinese barbecue sauce and 1 tbsp light soy sauce together in a bowl.
Pour over 500 g (1 lb) pork shoulder (cut into large pieces), mix, then cover and chill for 2 hrs or overnight.