I have a lot of papalo in my garden, and want to preserve it. What method should I choose to do this? I want to use it throughout the winter, and maybe some next year. The internet suggests that drying is not a great option, so I am looking for other preservation methods.
It seems that you've already done some research on the subject, as you mention that it doesn't dry well. Searching for 'papalo' using an internet search engine found http://www.appalachianfeet.com/2010/05/07/how-to-grow-and-use-papalo-wrecipes/ :
It doesn’t dry well, but it can be frozen if it is pureed with water or oil and put into ice cube trays.
This method is mentioned in one of the answers to a related question.