These dried grapes (sultanas) are produced exclusively from Sultanina grapes. This variety replaced the local Cretan varieties of grapes in the early 20th century, when refugees from Asia Minor arrived and began cultivating Sultanina grapes using their traditional skills and knowledge.
Due to the island's low level of precipitation and long hours of sunshine in July and August, these grapes have an extremely high sugar concentration. The grapes are harvested from mid-August through mid-September and are put to dry immediately after they are picked.