+1 to Balthazar in NYC.
Deca in the Ritz Carlton Chicago, a Four Seasons Hotel has a very good version.
My fondest memories of FOS in the US and Canada include:
La Cote Basque, NYC which sadly closed many years ago....
Swann Lounge, Four Seasons Philadelphia
Feenie's, Vancouver, also which has closed
Chartwell, Four Seasons Vancouver, also which has closed
Bouchon, Las Vegas ^
and my own which friends and family request me to make it regularly....