Cantillon Saint Lamvinus

Wow!. St. Lamvinus is a fruit lambic. It is wonderfully tart with a musty slight sweetness from grapes. It resembles Kriek, but uses grapes instead of cherries. Here is the description of the beer from Cantillon:

"The grapes, of the merlot and cabernet-franc varieties, are soaked in Bordeaux barrels containing two to three years old lambic. The beer is not blended before the bottling. The foam is caused by the addition of a liquor which starts the fermentation.

It was rated on BeerAdvocate.com as one of the 100 best beers in the world on 29 December 2005, 01 March 2007, and 09 October 2013. 

Rating = 7 glasses.