Ommegang Biere de Mars. Really, really good!
Here is a little info on the brew:
Ommegang Bière de Mars is a Belgian-style amber ale with a bit of magical space dust woven in - Brettanomyces bruxellensis, a wild-yeast used in the secondary fermentation. The Brett imparts added tartness, a bit of zing and some farmhouse funkiness. Also dry-hopped, this new ale continues our exploration of using Brett for secondary fermentation in limited-release beers.