Add pork, tequila, lime juice, garlic, chili powder, cumin, cayenne and chicken stock to a crockpot or pressure cooker.
Cook on high in an electric pressure cooker for 80 to 90 minutes, or for 5 to 7 hours in a slow cooker.
When cooked, remove from cooker and shred using two forks.
Serve up in corn tortillas and top with mashed avocado, jalapeño, red onion, queso fresco and cilantro. Serve with lime wedges.