Place pork, the Molli Yucatan marinade and chicken stock in the slow cooker. Cover with lid and cook on low for 8 hours (or high heat, for 4 hours). The pork should be falling apart when finished.
Take our the meat from the slow cooker, but reserve the liquid. Using two forks, pull pork into smaller strands and set on a platter. Add liquid from the slow cooker to the pork, one cup at a time, until the pork is moist.
Serve pork on a warm corn tortilla and garnish with fresh cilantro, diced onions and a squeeze of lime. We like to add a slice of avocado too. Provecho!
If you don’t have time to marinate or you forgot, you can skip this step.