By AURELIA MOUSSLY / AFPTV / AFP Dreamt up in the 1960s to attract tourists, Spain’s three-course “menu del dia”, or set lunch menu, has long been seen as the best deal in town. Dreamt up in the 1960s to attract tourists, Spain’s three-course “menu del dia”, or set lunch menu, has long been seen as the best deal in town. But with inflation hovering around 10 percent, its affordability is under threat as restaurants seek ways to economise. For a starter, main course and dessert or coffee (or both), bread and a drink, the average price is around 12.8 euros ($12.60), according to figures from Hos…