Just another spinach substitute - I was advised to cook it in coconut "cream" and it was good - but I think proper "summer spinach" would be even better, and so would my favourite sub which is the NZ stuff or the wild version of NZ that grows on sunny Atlantic coasts - I think the french call it "tetragon".
Incidentally, wild sea beet leaves from the E coast are by far the next best - much better than any of the other chardy ones.
Cheers.