Monday, late for dinner, in my opinion, two houseguests and I walked into South Edison, one of the relatively new Montauk restaurants, hoping to get something to eat. A few minutes before 10 p.m., and the place was ringing with conversation. Nearly every table was full, and, after the flustered hostess said something about a big order and how they probably could not seat us, we headed to the Hideaway over on the lake for some Mexican food.