1. Preheat oven to 400°. Wrap pork in foil, and heat for 15 minutes.
2. Meanwhile, cook next 4 ingredients (through garlic) in a skillet, stirring, for 7 minutes or until hot. Add vinegar.
3. Blend sweet potatoes with chipotle chiles in a separate bowl.
4. Slice pork thinly. Fill taco shells with mashed sweet potatoes, sprout mixture, pork, and red onion. Serve with sour cream and lime wedges.