Remember the Asian Leaf Mustard that I use for stir-frying with noodles? Besides anti-cancer properties, this vegetable is power-packed with benefits - helps in detoxification, improves digestion, reduces excess phlegm in phlegmy coughs, etc. Hmmm...more Asian leaf mustard to come.
If you have ever tried Chinese Noodle Soup with Preserved Mustard Vegetables and Shredded Pork, or 雪菜肉丝面 in Chinese noodle eateries - this preserved mustard vegetable is in fact preserved Asian leaf mustard greens, otherwise known in Mandarin as 雪里红(Xue Li Hong) /雪菜(Xue Cai) - the preserved version of 芥菜(Jie Cai) or Gai Choy.

Now I have set myself TWO difficult challenges. First, to preserve my own leaf mustard. Second, to create a vegetarian dish out of my homemade preserved leaf mustard (it is definitely a relatively easier route (more common too!) to stir-fry the preserved leaf mustard with pork or chicken).
With vegetarian, I need to think further of creating flavors. So let's tackle the more difficult one first.

Preserving Asian Leaf Mustard
Preserving Asian leaf mustard is not difficult. You need salt, the key ingredient (leaf mustard) and a large Ziploc bag. Rinse the vegetable to remove the grits/sand. Break the vegetables at the joint to separate leafy portions and firm stems. Put them into the Ziploc bag. Add generous amounts of salt (Note: you will see the vegetables gradually wilting down when salt is added and this is what you want - the salt removes the moisture from the vegetables). Then seal the bag and roll/squeeze the bag real tight with the vegetables inside. This also removes water-moisture from the vegetables. Also try to remove air from the Ziploc bag by releasing the air once in a while while roll-squeezing. When done, seal up the bag of vegetables and leave in the fridge for at least 24 hrs. Before using, squeeze the vegetables to remove all the remaining moisture (best to remove as much moisture as possible). You will notice that in the salting process - the leaf mustard greens have turned from green to darker green.
"....salting, which draws out water (and bitterness) from the veggies and makes them sweeter (in theory), crunchier (for sure) and more tender (not a contradiction)..." - says Mark Bittman in a recent New York Times column.
The preserved greens are ready for Preserved Leaf Mustard Greens with Crisp Tofu Stir-Fry 清炒雪菜豆干