It's detailed above But not on time. The method of tonic is: pig's feet (3 kg), ginger 1 kg, 30 eggs, 2 bottles of sweet vinegar (Bazhen sweet vinegar is recommended), and one big tile pot. The practice is: chop the pig's feet quickly, fly water, and cool for later use. Slice ginger, cook and shell eggs. Pour all the ingredients into the earthenware pot, boil over medium heat and turn off the heat. Just boil it in the second or third day. Boil it on the third day and you can eat it. 15 days is not bad as long as it does not touch raw water.