They changed the bday certificate to be used only towards the regular menu now, not lounge menu. Try the exoticmojito, even though I felt like it could have been a bit stronger for what you pay for.
Birthday beware! The birthday certificate is NOT valid Fri-Sun anymore! I just learned this when I came in on Sun for my birthday dinner. It entered effect in December 2010:
At Benihana, it's not just a meal, it's an experience. Enjoy teppanyaki favorites like Hibachi Steak, Chicken and Shrimp, as well as sushi and sashimi. Become a member of the Chef's Table! http://www.benihana.com/thechefstable.