My penniless Chicago-based twenty-something son & his friend are planning a special President's Day weekend in NYC. I scored on his Christmas present with a gift certificate to a Chowhound-recommended vegetarian place in The Windy City (Green Zebra): they LOVED it. Now looking to follow-up with a birthday gift: an out-of-their-price-range NYC very special vegetarian place. A place they'll remember. Any suggestions?