Make the Marinade: Pound the garlic and cilantro roots together in a mortar and pestle until they form a smooth paste. Add this paste to the other marinade ingredients and stir until the marinade is well mixed.
Marinate the Pork: Prepare the pork by cutting it into long segments that are approximately 3 inches wide by 1-2 inches tall. Pour the marinade over the pork and cover with saran wrap or place in a Ziploc bag. Let the pork marinate in the refrigerator for 24-28 hours.
Cook the Pork: Preheat the oven to 400 degrees. Place the marinated pork on the grill rack of your baking pan and bake for 30 minutes. Allow the pork to rest for 10 minutes, then slice into thin pieces and enjoy!