Ginja berries, also known as ginja, are small, red fruits that grow on the ginja tree, primarily found in Portugal. These berries are known for their tart flavor and are often used to make a traditional cherry liqueur called ginjinha. The liqueur is typically served in a shot glass, sometimes with a piece of the fruit included. The berries are harvested in late spring and early summer, when they reach their peak ripeness. Ginja berries are not commonly eaten raw due to their sour taste, but they play a significant role in local culture and cuisine, especially in the Lisbon region of Portugal.