Had always wanted to try Burger Bar, and finally did on this trip. Ordered the kobe burger with foie gras. I had originally ordered the truffle sauce, but it came without the truffle sauce, but instead came with truffle mayo. My server realized the mistake, and apologized and said that she would make the correction to my bill. didn't mind since the truffle mayo was excellent. The burger was fine (not sure I'd go with the kobe again since I didn't notice that much of a difference from a regular beef burger). Foie gras was nice addition. Sweet potato fries were very good too. Ordered a caramel milk shake after lunch which was very good too, but killed my appetite for my dinner a Sage later that day. Not sure I'd make Burger Bar a destination, but if you're nearby, I'd recommend it for a burger. Service was very attentive.