Combine the pork, pork and beans, onion, tomato, chorizo, and pork broth in a slow cooker. Slow cook in high mode for 5 hours. This will make the pork pata very tender and the soup more flavorful because of the flavors extracted from the ingredients.
Once the pata becomes tender. Add water and Napa cabbage. Continue to slow cook for 1 to 1 1/2 hours.