The island of Thassos has been known for its olives since ancient times. The famous Thassitiki olive of the Throumba variety was even named after this island. These olives are harvested from early November through mid-January, when they become fully ripe or even overripe and develop their distinct black color.
Due to the presence of the Phoma oleae fungus, Throumba olives lose their bitterness while ripening and can be eaten straight from the tree. The olives are primarily picked by hand in order to avoid any bruising of the fruit. After picking, they are washed in mountain spring water, graded by size, and cured in coarse salt.