I would use a gritty open compost, this can be purpose bought stuff or mix up your own from general purpose adding wash sand, grit and perlite.
Dip the tip of the shoot in hormone powder, remove some of the leaves if it looks like the cutting will be stressed and then insert the end of the cutting into the compost to about 2 to 3 cm.
Keep the compost just moist and place in a bright spot but not direct sunlight and rooting should be in 2 to 3 weeks. Watch out for fungus attack around the base of the cutting and water with Cheshunt if it is a problem.
However, at this time of year it wont make a huge tuber to carry over to next year I fear.
Jerry