If you choose where to go carefully you can eat well at very little cost here in Spain. Our friends John and Jean are very good at finding good value food. Yesterday they introduced us to a restaurant in Algorfa where we an excellent lunch for 7,50€ (just over £5).
Typically the good value meals are "menu del dia" and offer a limited choice of first and second courses including a plate of salad, a drink and bread followed by either a dessert or coffee. I always think the first course is the most interesting because it varies widely from restaurant to restaurant. The second course is usually a fillet of chicken, fish or pork accompanied by chips (no vegetables). The dessert is usually flan, tart, ice cream or rice.
When we go to Guadamar we eat at the Canada Bar which offers a similar deal and again provides excellent value for money. I thnk the clue is to see how many Spaniards are eating in these places at lunchtime. By 2:30 the place we went ot yesterday and the Canada Bar are usually packed which we take to be a good sign.