Add 2% of the cabbage’s weight in salt to the bowl
With your hands, mash and massage the salt and cabbage together until a decent amount of water begins to pool at the bottom of the bowl (upwards of 20 minutes)
Transfer the cabbage to a jar, and pack it down very tightly until the waterline is above the cabbage
If more water is needed, mix up a 2% salt-in-water solution and pour until the waterline is just above the cabbage
Weigh down the cabbage leaves with something like plastic wrap and weights or a plastic bag full of water so nothing can float to the top