Supposedly, at the beginning of this year, Tramonto himself left the Westin, and the restaurants were supposed to change names.
They haven't changed names... I do not know the status. I'd recommend calling the (cough) "North Shore" Westin and asking if the restaurant is still run by Rick Tramonto. Just down the street is Pete Miller's, very good steaks.
Prarie Grass is well loved here (I haven't been though)
If your price point is not an issue, you might want to try Lovell's in Lake Forest -- run by the son of Apollo 13 astronaut Jim Lovell, lots of memorabilia. I've heard it's good, but haven't been there either (it's high on my list).
What is patriotism, but the love of good things we ate in our childhood?
-- Lin Yutang