Sorry to be a downer, but I think the reason apple and rhubarb pie works (sweet and sour) means apple and rhubarb cider won't. Maybe if you halt the ferment half way through, but most of the sugars in cider are converted to alcohol, and it actually tastes sour itself. I don't know much about techniques using real fruit, though, so there might be a way.
Yes I know a couple of ppl who make this.There might not be much on the web about rhubarb cider but look up rhubarb champagne...
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