The French name for this northern dish, an excellent accompaniment to roast pork or game, is Chou rouge à la flamande. Slow-cooking produces a wonderful result.
Preheat the oven to warm 170°C (325°F/Gas 3). Quarter the cabbage, cut out and discard the stalk and shred the cabbage finely. Put the cabbage in a large saucepan of boiling salted water (there should be enough water to more than cover the cabbage), bring back to t