Luna has spent her whole life dining in the finest food that the castle chefs could offer. Whenever she ate at a restaurant it always had at least five stars. This all day well with her, until one day, while she was doing her nightly duties she saw a pony very happily dining in things that were below the standards placed on her dining. This piques her interest.
She's made up her mind. She would find this "fast food" and try it for herself.