This recipe is a favourite of all Ankh Morporkians, living as they do in the middle of the biggest cabbage growing district of Discworld.
Put the water in a pot and boil over a fire until it is boiling hot. Make sure that all the water does not evaporate, it will be needed for the next step.
Take the cabbage, rip the outside leaves off and feed them to the dog or the snails. Rip off a few of the succulent leaves from the inside of the cabbage. Wash the newly ripped leaves in some water (be sure not to use the boiling water at this point). Place the washed and ripped leaved into the boiling water. Boil for as many hours as is needed to completely remove all taste from the cabbage. Salt to taste.