Food is Silicon Valley’s signature employee benefit, but when it comes to providing a free lunch, not all tech companies are equal. Google Inc. and Facebook Inc. have the resources to hire five-star chefs, while startups and smaller companies have made do caterers. But a high-profile defection from the Googleplex might shake up the catering business. Scott Sasaki, who ran a Google eatery, just landed at Cosmopolitan Catering, an upstart catering outfit aiming to be the official kitchen of Silicon…
