Oude Kriek Boon is a spontaneously fermented beer, made from old and young Lambic of Lembeek matured in oak barrels. Quality is guaranteed by the exclusive use of real cherries (25%), was originally produced by a barrel Lambic of 6 months of age or older to add cherries, creating a new ferment in the barrels. After another 6 months the result is a fresh, sour-sweet, non-foaming and red beer with the taste of cherries.
Original cherry-lambic was prepared by adding Schaarbeek cherries. Since this variety has become rare, other varieties are now used.
According to the European rules of "guaranteed traditional specialty", GTS is a sour cherry beer produced by blending different types of lambic. It contains between 10% and 25 cherries (fruit, juice or juice concentrate). The difference between an old (Oude) and a Kriek Kriek Fruit Lambic or between one or Old Fruit Lambic, among other lies in the fact that the Oude Kriek / Old Fruit Lambic has undergone a secondary fermentation and bottled on yeast.