Ethnic food -- from Korean to Thai to El Salvadoran -- has become more familiar to the average U.S. consumer, and increasingly people are finding out about these cuisines not from mom-and-pop restaurants or specialty stores, but via food trucks. The movement is helping pave the way for the increasing popularity in ethnic street cuisine "because of how food trucks work. They've allowed those flavors to more easily surface and spread through cities and allow more people to try them," said Kazia Jankowski, associate culinary director at...