Jerusalem artichokes are related to sunflowers.
I tried cropping sunflower heads (for my parrots). Got loads of seeds, but it takes hours and hours, no DAYS and DAYS to get all the seeds out by hand, tears up your fingernails too. I did get a carrier bag full...worth about 38p in the petshop!

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~ What do I think of Western civilisation? I think it would be a very good idea ~ Gandhi