Put rock sugar in a large pot and caramelise it on high heat. Add the bag of herbs and spices, chicken bones, pork bones, chicken stock, garlic, ginger, chives, light and dark soy sauce, and season with salt. Bring it to the boil, then simmer for 3-4 hours on low heat. Remove the marinating soup from the heat and leave it overnight.
The next day, bring the marinating soup to the boil and strain. Keep the fat of the soup.
Chef tips: All the herbs and spices you can buy from Chinese pharmacies or a Chinese spices store. The herb and spice bag can be used two times. Dry and keep it in the refrigerator to refresh your ten years soup, which can also be used to cook red meat, like pork, chicken, beef, or game.