I used something close to this recipe: http://smittenkitchen.com/blog/2013/06/pickled-vegetable-sandwich-slaw/
That gave me enough liquid to fill one large Mason jar. The results are still out because this was only 15 minutes ago.
Have a small jar with more cabbage (I had to use the whole head, which I got from my CSA – www.farmerjoesgardens.com) So I made some brine, but I didn’t measure, so it seems too salty. We’ll see.