When we went to Spain, we had been told that it was hopeless for vegetarian food.
We have to put the record straight. As long as you go carefully through the menu, there is plenty there - very tasty, very wholesome and very nutritious. The mistake is to ask them if they cater for veggie. They look surprised and just say no!
We ate wonderfully well. We even found organic veggie in both Sevilla and Tarifa!