If they still have the leaves on, chop them off and discard. They are dangerous, but the stalks are lovely.
Wash, chop them up into equal sizes, very gently stew with sugar and a good pinch of powdered ginger if you have it and serve with custard.
Remove the leaves and any dirty looking bits at the bottom.
Wash it.
C hop it into equal bite sized pieces then put it in the microwave with just the water adhering to it.
Blitz for a minute then stir. If it is still not tender, give it another minute.
Add sugar to taste with ground ginger if you like ginger.
Alternatively, wash it and chop it and use it under a crumble topping or a sponge topping as you would for apple crumble or Eve's pudding.
You'll need more sugar for rhubarb than you do for apples, though.
If you are worried about oxalic acid, it won't be a problem. Well, not unless you can eat over 5 pounds of rhubarb in one sitting, Then you might have to be concerned.
As a kid I used to eat it raw, nicked, I mean borrowed from a local field. Didn't half used to give me belly ache though, but I'd still go back for stick after stick!
My Mum used to give me a stick of rhubarb and a paper cone with sugar in it and I would sit on the doorstep, happily dipping the rhubarb into the sugar and munching away.
At other times, she would give me half a pomegranate and a pin to pick the seeds out and that would keep me good for ages.