Koroneiki is a Greek variety of olive from the Peloponnese Islands that yields a robust, fruity oil with a strong, peppery finish. Koroneiki olive oil can be extremely pungent and grassy right after pressing. It mellows as it ages and hints of banana and pineapple begin to emerge. Koroneiki has an extremely high level of polyphenols, an antioxident with human health benefits. Polyphenols also give olive oil its pungency and prevent oxidation and rancidity. As a result, if stored properly, Koroneiki can have a shelf life of two to three years. Koroneiki olives are very small and turn red to purple when ripe.