My mother-in-law is in town on the 21st. She's a long-time New Yorker, now retired to Denver. (Don't ask.) Anyway, she loves froo-froo French restaurants. I have a reservation for Ilo, which I know is not French, but I thought might be froo-froo enough to fit the bill. I considered Montrachet, but know nothing about it. Any suggestions? She's been to Jean-George, Le Bernadin, and Lespinasse, and Bouley, so those are out.