The best menu del peregrino that I had on the Camino was at Como Sapiens in Atapuerca - well worth a stop if you're there for there night. (There was also an excellent albergue here too).
However, night time is not the best time to have your main meal of the day if you've been walking all morning. You should really try to have a bigger meal at lunchtime and just have something small in the evening.

