Combine salt, cumin, chili powder, oregano, black pepper, cayenne pepper and cinnamon in a small bowl and set aside.
Make sure the pork tenderloin is trimmed of any fat or skin, if desired. Then place the tenderloin in a crockpot that has been sprayed with cooking spray. Sprinkle/rub the dried seasonings on top of and all over tenderloin.
Next, stir together the garlic, chipotle sauce, orange juice, lime juice and zest, picante sauce, and beer. Pour on top of and around the tenderloin. Dot the butter on top.
Cook on high for one hour, then on low for about 6-7 hours. Can also cook on low 7-9 hours. If there's time, I like to start off the crock pot cooking on high to get things going.
Befor serving, take the meat out of the crock pot and shred with two forks, or use cooking shears to have more uniform size pieces of meat. Place back in the sauce. Sprinkle generously with cilantro.
Last optional step:Place tenderloin in a serving dish, uncovered, in 435° oven for about 5 minutes--I usually do this while making my Simply Perfect Oven Rice. I place the serving dish of tenderloin next to the rice for the last few 5-8 minutes of the rice cooking time. You can also warm up your flour tortillas at this time as well. I place a small piece of damp paper towel on top of several tortillas then wrap tightly in foil and put on the oven rack for about 5 minutes. Serve on warm flour tortillas with shredded cheese, cilantro, green or pickled red onions, lettuce, lime juice and sour cream. Yellowbird Jalapeno Condiment goes well with them too! Enjoy!