For the spareribs750g/1½lb pork spareribs600ml/1 pint groundnut (peanut) oil For the marinade1 tbsp Shaoxing rice wine or dry sherry1 tbsp light soy sauce1 tbsp Chinese black rice vinegar or cider vinegar2 tsp sesame oil1 tbsp corn flourFor the sauce2 tbsp finely chopped garlic2 tsp five-spice powder3 tbsp finely chopped spring onions3 tbsp Chinese rock sugar or granulated sugar3 tbsp Shaoxing rice wine or dry sherry150ml/5 fl oz chicken stock1½ tbsp light soy sauce2 tbsp dried grated orange peel85ml/3fl oz Chinese black rice vinegar or cider vinegar