slice - could use a food processor 3 minutes
dry in Excalibur food dehydrator prep time 1 minute, slide into baggies when dry.
grind in coffee or seed grinder 1 minute
A lot of work. Depends how well equipped your kitchen is. You could cut the tubers into small cubes, and then dry them. At that point you could use a mortar and pestle to get a coarse grind. I think the hardest thing would be to find the tubers to grow. I don't think Ive seen them around here (rural Alabama).
Or, you could just grate the flesh of the turmeric and use it fresh, as Metrosideros suggests below.
