You can put them in a crock pot with perhaps some salt and pepper...and nothing else (including no liquid). The roasts have enough water and fat in them to create their own braising liquid. This should yield quite a bit of pulled pork, with very little added flavors. Separate the pork into individual packages and freeze. This gives quite a few menu options...carnitas, pasole, sandwiches, etc. Just thaw and season based on individual recipes.