What type of fruit is commonly used in Kriek lambics?

Kriek lambics are traditionally made using cherries, specifically sour or tart varieties like Morello cherries. This fruit is integral to the brewing process, as it adds distinct flavors and aromas that complement the base lambic beer. The cherries undergo fermentation with the lambic, resulting in a complex interplay of sweet, tart, and fruity notes, which define the style.

This style of beer is a clear example of how fruit can enhance and transform the base flavors of beer, leading to a unique profile that is both refreshing and complex. Other fruits like apples, peaches, and bananas are used in different styles of beer but do not hold the same significance in the context of Kriek lambics. While these fruits can impart their own flavors, they do not contribute to the traditional characteristics that define Kriek.