Whenever I got to harvest a cabbage I always leave the stalk and some outer leaves in the ground and just cleanly slice the head off.
A few weeks later you should find that you have a whole bunch of little cabbagelings sprouting from the base. Which means a second crop from the same plant, and miniature food. Who doesn’t love miniature food!
Its a really simple way to get double the cabbage crop from the same plants with basically no effort at all and I am all about the lazy gardening when I can!