Bitter orange also known as Narenj or Seville orange or sour orange, is a citrus fruit with a tangy and slightly bitter taste. It is commonly used in Persian, Middle Eastern and Mediterranean cuisines for its juice, zest, or peel. Bitter orange is often added to stews, marinades, and sauces to enhance flavor and is also used to make marmalade. Additionally, it has traditional medicinal uses due to its aromatic and digestive properties.