From a beat-up postal van turned food truck, Coolhaus has rocketed to a national brand. Yahoo called it "the best ice cream in America." The inventive sandwiches, named after famous architects, are sold in supermarkets across the country, as well as from trucks in Los Angeles, New York, Austin, and Dallas. Coolhaus has drawn accolades from the New York Times , Every Day with Rachael Ray , Time , and Good Morning America , to name a few, and from such...