Pommes Souffle in LA ?
Cinch in SM serves it with their strip loin. Downside is the food is inconsistent. Ortolan served it earlier this year with one of their filet mignon courses. You can always request it ahead of time if they're no longer serving it. The now defunct Chasen's used to serve it and if you can find their old chef working at some other joint I won't be surprised if he/she will whip up some for you.