The Magic Mojo in which they are marinated at La Ranchera is a given. From there you can make a rub with whatever flavors and spices you like. For me the emphasis was on Chipotle plus the Adobo base I use on most everything.
Well, you and I will get along very well. Just last night I crock potted a bunch of bone in beef short ribs with beans and various spices, the most important being the chipotles in adobo. I swear it was even better tonight when I got the leftovers.