Mestreechs Aajt is a distinctive Dutch beer from Gulpener Bierbrouwerij in Gulpen, rooted in medieval brewing traditions from Maastricht. This dark, sour ale undergoes spontaneous fermentation in oak barrels—a process taking a full year to complete.

The beer balances sweet caramel notes with refined sourness and fruity character: sour cherry and grape emerge alongside subtle funkiness. The palate begins sweetly before the fermentation signature asserts itself, finishing dry and complex. At just 3.5% ABV, it achieves remarkable depth and character despite modest strength.

This revival of a lost red sweet-and-sour ale tradition represents a singular Dutch brewing heritage, regarded by enthusiasts as an underappreciated classic.