You can pretty much use it for anything that you would use spinach for - it's also used in spanakopita (greek silverbeet and ricotta pie/pastries, there is also a turkish equivalent), it's great in vegie lasagne, vegie curries and stirfries. It can be lightly steamed/wilted and served as a side with butter, pepper and a bit of nutmeg.

Good luck with whatever you do with it - it would be delicious fresh from the garden! Yum!!