Tart cherry soup is a refreshing and tangy summer dish that is popular in Eastern European cuisine. Made with tart cherries, sugar, and a hint of lemon juice, this soup has a vibrant red color and a sweet-tart flavor. It can be served chilled as a refreshing appetizer or dessert, or warm as a comforting soup. The tartness of the cherries is balanced by the sweetness of the sugar, creating a delicious and unique flavor profile.