Restaurant buzz: East Hampton neighbors Mariska Hargitay, Steven Spielberg and Kate Capshaw enjoyed dinner at Rowdy Hall last week. Katie Couric enjoyed a seafood lunch at Bostwick’s Chowder House in East Hampton on Saturday. Montauk’s Crow’s Nest chef James London is now the executive chef at Co-Op Food & Drink in New York. East Hampton’s best selling author Tim Ferriss debuted his new book, 4-Hour Chef, at Panera Bread outlets in New York last week. The book is currently available online through Amazon.