Found this restaurant on tripadvisor when visiting Cangas De Onis.
To be honest if it wasn't for this site I would not have found it, it is tucked away in a corner of a sideria.
Spoke to the waiter and he made some recommendations which we followed. The Food was excellent and the cider good. It is a bit spit and sawdust but that adds to the appeal.
I would eat there again and would recommend a visit, it is reasonable priced too, approximately €25 including three bottles of cider. A good night out.