Rinse dried lily bulbs under running water; Soak them in water for 3 hours; Remove and drain them.
Rinse dried tangerine peel; Soak it in water for 3 hours; Remove it; Gently scrape off any white pith.
Rinse raw pearl barley under running water; Soak it in water for 1 hour; Remove and drain them.
Rinse dried prickly water lily seeds under running water; Soak them in water for 30 minutes; Remove and drain them.
Rinse dried lotus seeds under running water; Soak them in hot water for 10 minutes; Remove, drain and core them.
Rinse winter melon under running water; Scrape out the seeds; Peel it with a Y-shaped peeler; Cut it into chunks.
Rinse, drain and slice ginger.
Rinse lean pork; Pat-dry it with kitchen paper; Cut it into large chunks.
Fill a deep pan with water; Add the ginger; Bring to the boil over a high heat; Scald the lean pork all over in a colander with the boiling ginger water for 1 minute;Immediately remove it; Rinse it under running water till cool; Drain it; Turn off the heat.
Fill a stockpot with 2800ml water; Add the dried prickly water lily seeds, the raw pearl barley and the dried tangerine peel; Bring to the boil over a high heat; Add all the remaining ingredients, and bring to the boil over a high heat again; Turn to a low heat; Cover the pot with its lid; Cook over a low heat for 2.5 hours; Stir seasonings into the soup; Turn off the heat; Arrange the soup into serving bowls; Ready to serve.