Eric Greenspan has worn an array of chef hats over the last 30 years but with the opening of his long-planned Mish Delicatessen in the Fairfax District, he hopes to add another: steward of the Jewish deli. So he sold his Maré restaurants and Eric Greenspan’s Grilled Cheese, but promised that if he ever opened his own restaurant again, it would be a Jewish deli. Namesake inspiration on the wall of the dining room of modern Jewish deli Mish. He called restaurateur Bill Chait, a longtime business associate, and pitched partnering in a Jewish deli. That his Jewish identity was ever called into question, especially as he endeavored to open a Jewish deli, was “laughable,” according to the chef.