"Holsteins at the Cosmopolitan of Las Vegas is renowned for its spiked milkshakes stacked high with doughnuts and other sugary toppings, but the burgers are equally inventive. The Billionaire Burger pairs wagyu beef with foie gras, truffle mayo, and port onion marmalade for a result that’s worthy of its title. Diners can also add foie gras to any other burger for $12." - Krista Diamond