Ariston is one of the oldest snack places in Athens. You can tell from its decoration, which I believe has stayed the same for many many years. Ariston is famous amongst old Athenians as the shop with the best cheese pie in Athens. I remember as a kid ending our Saturday shopping morning in the nearby Ermou street, with a cheese pie from Ariston.
Today, Ariston pies have the same quality as they did in the old days. In Ariston you will find not only cheese pies, but a great variety of many different pies. The pie is a traditional Greek snack, ideal for breakfast but it can also be served as a main/side dish.