Mustard Greens with Salt-cured Egg Soup

An Easy and healthy family soup that is also quick to make. Salt-cured duck eggs are readily available in Chinese supermarkets these days, but they are not actually difficult to make (see recipe), even though it takes four to six weeks for them to mature. The depth of savouriness they add to this soup makes it worth one’s while either to go to the supermarket or to make them oneself.