Heat the fat or oil in a large heavy-bottomed pot until brown, then brown the tenderloin and pork belly for 5 minutes at medium heat. Add onion and cook for another 5 minutes, stirring regularly.
Add turnip, carrot, green onion, salt and pepper. Stir; add water and herbs. Reduce heat; cover and cook for 45 minutes. Stir occasionally; add a bit of water if necessary to keep it from drying out or sticking to the pot. Serve hot. Makes 4 servings.