Place pork in a slow cooker
In a small bowl, mix together all the spices. Rub on all sides of the pork.
Add mixed garlic, onion, lime juice and orange juice to the slow cooker.
Cook on low for 8 hours.
Remove pork and shred. (I like to cut the pork tenderloin into about 3 pieces and then shred so the pieces of pork are not too long. I also sometimes cut up the onion a bit if the pieces seem too big.
Return to slow cooker and toss with juices to coat evenly.
Serve over white rice or cilantro lime rice with pinto beans and your favorite taco toppings. We like it with guacamole, salsa, plain yogurt or sour cream, and cheese.