Fleur, Las Vegas. One of the best burgers ever. In fact, Vittorio Marzotto of Ca’ del Bosco is conducting a (highly subjective and unofficial) survey across the US, and he assures me this is definitely in the Top 10.
Hubert Keller, thank you for validating American cuisine in the eyes of our Italian brethren.
Help Vittorio out!
If you know an excellent spot to enjoy a classic American hamburger anywhere in the US, put it in the comments and I will send him your recommendations.