Rinse salt from pork, set aside.
Remove stems from mustard greens.
Wash leaves thoroughly, tear into bite-size pieces.
Place greens in a large Dutch oven (do not add water).
Add pork, cover and cook over high heat 10 minutes or until pork is tender.
Add cubed potatoes and 1 cup water; cook over medium heat 20 minutes or until potatoes are tender.