The Lou Pepe Gueuze is a blend of three different 2-year-old lambics. The inclusion of the younger lambic (which still has some unfermented sugars in it) sparks a refermentation in the bottle that gives Gueuze its famous champagne-like spritziness. The simple idea behind the special Lou Pepe blend is that it should have much more of the taste of old lambic, which is of course much harder, drier, more sour, and more complex than the young stuff.