It is recommended that you add a little bit of rock sugar and simmer for 2 hours. In addition, the yellow flower gum to choose the old a little bit of flower gum, the efficacy of the old gum than the new gum to be a lot better Oh, and the old gum has no fishy flavor, and not to have to eat our old gum, but the objective fact that Oh, the older the gum the easier it is to absorb.