Sour Cabbage Northern Style

1. Cut each bok choy lengthewise into two pieces.
2. Boil water in a lage wok. Cook each bok choy into the water for 20 seconds, turn it over and boil for another 20 seconds.
3. Remove all the bok choy to a lage crock sprinkle some salt, press a heavy rock on top. Pour cold boiling water in rock, must cover bokchoy for 2 inches. Cover the crock (or cover with a plastic papper) to keep from getting dirty.
4. Leave it for 14-20 days, the bok choy will become sour (but still crispy). This is Northern Style Sour Cabbage.

Notes:

1. Split cabbage, boil for 20 seconds
2. Put in crock with a heavy rock on top.
3. Leave for 2-3 weeks. It will be sour.