Oca (Oxalis Tuberosa)

Recently I had an offer I couldn’t resist:
Send some exciting seeds, and you will receive some oca tubers.
They arrived by mail yesterday, and now have a spot in individual pots in the greenhouse. Thanks to Ian Pearson of London! Ian write blog on oca – it is most interesting.

Over the last years I have kindly turned down several offers. Being an Oxalis, they contain oxalic acid. I have not been comfortable with that, as it is suspected some people get kidney-stones from that – and I’m not asking for kidney-stones. But now I’ve read, that a thorough sunbathing (greenhouse or windowsill) can make the oxalic acid go away. Sweet low-oxalic oca sounds tempting, doesn’t it?