text:  The Olympic Games begin in France in just a few days. Paris is not the only stage. There'll also be sailing and soccer in the southern Mediterranean port of Marseille, which is France's second largest city, but sometimes overlooked. Yet a new cookbook is out to change that. It's by a Marseille native who wants you to discover the city through its food. Okay, I'm willing. But NPR's Eleanor Beardsley got the assignment.