Trader Joe’s Sour Cherry by Petrus is a blend of the famous Petrus Aged Pale Sour (a 100% Foeder beer that is aged 24 months in Calvados Oak Foeders {barrels}) and cherries. The result is this genuinely marvelous Sour Cherry, a harmonious union of tart and sweet embodied in one single remarkable beer. Enjoy while it lasts!