I think I stopped for a drink and something to eat in this yellow coloured restaurant in Sportinia in Sauze more than any of the other restaurants.
The food tasted good, the staff were always nice to me, it was self-service so you didn't have to wait, it was cheap, and whenever I went in there I always found a spare table.
I usually had a vegetarian focaccia, with aubergine etc. which they made for me and toasted, and a hot chocolate (which is sort of like chocolate mousse in a cup) and together they only cost 7.50 euros and that was quite enough for lunch. I carried a bottle of tap water in my rucksack so with that as well I was fine :)

http://www.lacapannina.net/index.php/en/