1. Boil 4 cups of water in a pot and blanch the pork for 2 minutes.
2. Drain and rinse pork in cold water.
3. Remove peel and seeds from the winter melon and cut them into big pieces.
4. Rinse and drain the barley.
5. Add the pork, winter melon, barley, shredded dried scallops, and ginger into a big pot with 12 cups of water and bring to a boil.
6. Continue boiling on high heat for 15 minutes, then reduce heat to medium-high and boil for 20 minutes, reduce heat to medium, and continue boiling for 30 minutes. Continue boiling on medium-low heat for 45 minutes.
7. Add salt to taste.