The original recipe can be found at A Year of Slow Cooking. I modified the directions to work with a 6-quart Nesco roaster, which can slow-cook, but not quite as slowly as a traditional slow cooker. I also used a different cut of meat than the original recipe called for; I was using what I had in the house.
I'm pleased with the results. This made a lot, and I'll freeze the extra for sometime when I need a quick meal (just reheat and serve in warm tortillas!)
2 pounds boneless pork roast
1/2 cup orange juice
1/4 cup lime juice (about 1 large lime)
2 tablespoons minced garlic
1/2 tablespoon kosher salt
1 tablespoon cumin
1/2 cup beef broth
sour cream and salsa for toppings
Use a 6 quart Nesco roaster. Preheat to 400. Rub salt and cumin all over the pork, then put the pork into the roaster. Add garlic. Mix the lime juice, orange juice and beef broth. Pour this mixture evenly over the top.
Turn the roaster down to 225 and cook for about 5 to 5 1/2 hours, or until the pork shreds quite easily with a fork. Remove the meat, leaving the drippings in the roaster. Completely shred the meat and return it to the roaster. Mix it with the drippings, cover, and turn the temperature down to "keep warm" until you're ready to serve it.
Serve on warmed tortillas with desired toppings.