Put 200 grams of salt in one catty of watercress and three catties of pepper. The ratio of adding salt to bean paste is 3: 2. Fine-tune it according to your own taste. Don't have too little salt. The bean paste has a certain salinity. Only when it reaches a certain salinity can the bean paste be preserved for a long time, will it not go bad, and the pickled bean paste will be more delicious.