The Leopardstown Inn is just around the corner and does good food (there's Green's Restaurant upstairs or you can eat in the bar), but if you're into Indian food at all, one of my favourite restaurants is [broken link removed] in Stillorgan village, about 10 minutes walk away from the Galloping Green pub.
Or the Stillorgan Orchard does good food - 5 minutes from Galloping Green, as well as a good Chinese up and around the corner from the Orchard beside the cinema.