How to grow them:
Leeks are fiddly things to plant, but worth it.
Dig a trench (about spade depth) and incorporate compost, rotted manure or store-bought organic fertiliser and dig well.
Carefully separate the thread-like leek plants and place upright about 10cm apart.
Once the row is laid out, gently backfill the trench part of the way up so only the tops of the leeks are showing.