The Seville orange, also known as the bitter orange or Citrus aurantium, is a small, round citrus fruit that is primarily grown in Spain. It has a thick, bumpy skin and a sour taste, making it less suitable for eating fresh compared to sweet oranges. Seville oranges are often used in cooking and baking, particularly for making marmalade. These oranges are harvested in the winter months and are prized for their high pectin content, which helps in the gelling process of preserves. In addition to marmalade, Seville oranges are also used in various liqueurs, such as Grand Marnier, and in some savory dishes for their unique flavor.