FORCING TYPE
Seed sown early in the ealry summer should have produced good size plants by early autumn.  Dig these up and transfer, planting into large containers.  Use a good compost and sand.  Trim the top of the plant off leaving a stub of plant about 3cm above groung level.  These should be covered with a bucket or something of similar size.  A large plant pot is good but ensure the drainage holes are well covered to stop any light from getting in.  Light will cause the leaves to be bitter tasting.  Put in a dark, warm place- a garage is ideal and in 3 to 6 weeks the plants should be about 20cm tall.  At this time they can be harvested.  The shoots will continue to grow back as you pick throughout winter so you'll have a continuous supply of crisp leaves.  The leaves may get smaller after the first harvest.