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Boon Geuze Mariage Parfait is an Oude Geuze from Lembeek, blended from 95% mild lambic aged at least three years in oak barrels, combined with 5% young lambic to drive fermentation and structure. Since Frank Boon acquired the brewery in 1978, Mariage Parfait has remained a cornerstone expression. The beer is unfiltered and unsweetened. The palate reveals layered complexity: apple, apricot and citrus zest notes emerge alongside a gentle tartness. Wild yeast and bacterial fermentation contribute subtle funky undertones. The finish is dry and balanced, with lingering acidity that frames rather than dominates. Time in the glass—and in the cellar—deepens its character.