Chinese Oxtail

1 tablespoon oil 2 half-inch thick slices of fresh ginger 6 cloves garlic 3-4 pieces of star anise 6 cloves 3 bay leaves ½ cup Chinese cooking wine (Shaoxing wine) 2 tablespoons dark soy sauce 3 tablespoons light soy sauce 1 tablespoon of rock sugar (you can substitute regular sugar) 1 1/2 cups of water Salt, to taste