Petimezi is a concentrated grape-must syrup, which results from evaporation through heating. It was used by the ancient Greeks, and by the ancient Romans. It served in ancient times as a sweetener, along with honey, and used as a substitute for sugar when sugar was too expensive, or for a healthy diet.
According to dietitians, a single tablespoon of petimezi, provides as much nutritional content as a bunch of grapes. Its high calorific value is balanced out by its high content in vitamins of the B complex, iron, calcium, magnesium, manganese, phosphorus, potassium, and copper.
It is used in sweets during baking and also as a sweet coating for some dishes, sweets, or salads. Today, petimezi is used throughout Greece; both light and dark syrups exist, depending on the color of the grape and the way it is boiled. When made in large quantities in pots, it becomes dark but has a lighter color when made bit-by-bit in a pan. It can be preserved for long periods of time.