Steve

I have lived in India and the UK, and I have never seen it spelled anything but cardamom. Perhaps it is a Statesian peculiarity?

My own spice peeve (Pet Spice?) concerns turmeric. I have heard too many English people pronounce it tyu-merr-ic, ignoring the first 'r' altogether, and the fact that even the dictionary says it is terr-merr-ic.