Spiced mustard knot in one's heart, the specific solution is as follows:

Clean it up, wash it, drain the water, marinate it with salt, turn it over one layer of vegetables and one layer of salt in a few days, pour the bottom on it, and boil the salt water in a large pot until the mustard water is weak. Besides salt, add pepper and star anise to the water, add whatever spices you like, cool it after boiling, pour out the original pickled mustard water and add the newly cooked spiced ones. You can also pickle mustard with boiled spiced soy sauce. You can add some sugar to soy sauce. It's best to boil the soy sauce and let it cool.