Caviar, the eggs of the sturgeon (oxyrrugochos). Herodotus and Strabo were said to be big fans. These days you are only likely to see it in high-end restaurants in Athens and Mýkonos.
On Sýros, they make χαβιάρι του φτωχού: (chaviári tou ftochoú) or 'poor man's caviar'. It's similar to French tapenade, made with black and green olives, capers, olive oil, lemon, parsley and oregano
Image by Marco Verch Professional Photographer and Speaker