From the menu...

"The Dogfish Burger Experience"
"Our tasty burgers come from local cattle fed the world's finest brewing barley (from our brewery just up the road in Milton, DE)! This beef is raised on a steady diet of brewing grains (pre-fermented, so there are no drunk cows wandering Sussex County)."

Excellent burger!!!! And the 90 minute IPA wasn't too shabby, either ;-) (Or is that the Pangaea? So many beers...