Tried a proper lambic yet?
Lambic is one of the oldest beer styles still being brewed, and is originating from Belgium. Lambic starts it’s life as wheat beer, which is then exposed to airborne wild yeast and bacteria, unique to the region, after which it undergoes a spontaneous fermentation.
The beer is then aged in old oak foeders (really big barrels) for up to several years. The different vintages are then blended, and when young and old beer is blended, you have a Geuze.
The Geuze can be consumes fresh, or aged for years to come!
Fresh fruit can also be introduced, and you create styles like Kriek (cherry) and Framboise (raspberry).