HEAT oil in stockpot; add pork, onions and garlic. Cook, stirring frequently, for 12 to 14 minutes or until pork is cooked through. Stir in water, hominy, enchilada sauce, chiles and oregano; bring to a boil. Reduce heat to medium; cook, stirring occasionally, 40 to 45 minutes or until pork is tender and stew thickens slightly. Top with cilantro and tortilla pieces before serving.