Pulled Pork Fajitas with Fresh Salsa Verde

Sprinkle pork with chili powder, 1/2 teaspoon of the ground pepper, and 1/4 teaspoon of the salt. Place pork in a 2-quart slow cooker (cut to fit in the slow cooker as needed). Pour 1/2 cup of the water over pork in cooker. Cover and cook on low-heat setting 9 to 10 hours or on high-heat setting 4 1/2 to 5 hours. Using a slotted spoon, transfer the pork to a cutting board. Using two forks, pull meat apart into shreds; reserve half of the meat for another use (see Tip). Discard the cooking liquid.

For salsa verde, combine tomatillos, onion, chile pepper, cilantro, lime juice, garlic, the remaining 1/4 teaspoon ground pepper, and the remaining 1/4 teaspoon salt in a small saucepan. Stir in the remaining 1/2 cup water. Cook and stir over medium heat 15 minutes. Let cool slightly.

To serve, top tortillas with the shredded pork, the salsa verde, and mango.