Yes you can cook it a bit like spinach with a few sweated shallots, butter, and cream at the end and serve under fish. It's a lovely accompaniment but soup would probably be too much for me. One day we will try it tho.

I have one plant and don't find it too invasive, but if you grow it in a pot don't the seeds get about anyway. It is better if you pick old leaves and flowers off so you use new growth.

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Paul