Alot of different ways that people can them. This is the easiest way to me:
Take several fillets of mullet and add them to about the bottom of the lid line on a mason jar. You can put hot mustard, jalapeno's, hot sauce or nothing at all to them. Do not add water or oil as the mullet will put off enough liquid to keep it moist. Seal the lid with new seals and rings, place in a pressure cooker (don't forget to add water to about halfway up the outside of the jar) and pressure cook for 1 hour. I swear this will be some of the best snack food you will eat out on a fishing trip or hunting. It will beat the hell out of a can of tuna. If you need some help just holler at me and I can walk you through it.