I use one of those ceramic horseradish graters, its ideal for ginger. they're available in any oriental grocery stores or at Crate & Barrel.
http://www.crateandbarrel.com/kyocera-ceramic-ginger-grater/
I use a knife, but I've seen TV cooks who cut it across grain in fairly short pieces (after peeling) and smash it with the side of a knife and call it a mince- can't really tell how well it works from the TV picture.
A knife? It's cuts really easily. I chopped it till it's fine just like garlic but if I want it really fine (ie if I'm putting it in a marinade or soup or sauce) I used a box grater or a micro plane. Lots of easy options...
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http://www.crateandbarrel.com/kyocera-ceramic-ginger-grater/