Muifelbrouwerij in Oss has brewed Zuster Agatha since 2007, a quadrupel with a strong track record. This Grand Reserve expression ferments with champagne yeast, adding complexity and fruity character to the dark, warming base beer. At 11% ABV, it develops a more refined profile than the standard version.

The nose shows dark malt, ripe dark fruit and grape notes. On the palate, caramel, toffee and chocolate emerge, with subtle grape undertones from the champagne fermentation. The finish is surprisingly smooth for its strength.