Westvleteren 12 from a brewery run by Trappist monks from the Abby of Saint Sixtus of Westvleteren. They only make enough beer to keep the Abby running despite demand for this beer, which some people call "The best beer in the world."
"Best" might be a stretch, but it is very, very good. The first smell is like fudge cooking, sweet but with depth. It has a creamy mouth-feel that coats my tongue with malt, chocolate, caramel, and a bit of coffee flavor.
It turns out this beer is extremely hard to get. In 2012 Craft Beer Cellar sold out their allotment in 30 minutes. So, it feels like a great gift to get this bottle in the Advent box. I can't wait to see what the next two days will bring.