Solid burger restaurant inside the Cosmopolitan. We came here for lunch and I enjoyed my meal overall.
Our waitress was super friendly and attentive, though it took a while for our food to come out. I ordered the Rising Sun burger (kobe beef, teriyaki glaze, nori furikake, crispy yam, spicy mayo & tempura avocado); my cousins ordered the Hen House burger (beef with fried egg & bacon); my sister ordered the Chopped Salad. Salad was pretty normal; I personally recommend trying one of their specialty burgers. Both of the burgers we ordered were tasty; I think the Rising Sun is creative (though I knew I wouldn't really like the teriyaki glaze all that much - a bit strong). But I loved the crispy yams and tempura avocado in my burger. You can also order special add-ons to any of their burgers, such as fried egg and foie gras torchon - yum! We ordered all of our dishes with the shoestring fries, which were also pretty tasty.
They have a pretty comprehensive beer list including a lot of microbrews. They also have a wide range of shakes - including alcoholic shakes - but I was too full to try them out.
Overall, I will probably return - for lunch or dinner - as I think they offer reasonably priced, high quality, creative menu items at Holsteins. Next time I'll try a shake too! Solid four stars.