Only the new potherb mustard is not pickled, the nitrite content will be the highest value, as the leaves are gradually pickled, part of the nitrite will be converted to nitrate, so that the nitrite content also gradually decline. Under normal circumstances, pickled vegetables are best more than 30 days before you can eat pickled potherb mustard after drying, it is best to be used to make buckwheat padding, or used to make potherb bean curd soup are very delicious.