Cecilia Polanco’s parents did not dream of their daughter owning a food truck when they emigrated from El Salvador to the United States in the early 1980s. Their expectation was that she would get a respectable profession after college, or even better, a career, like her older sisters who work in law and insurance. So when she proposed the idea of a pupusa business, her mother naturally had some concerns — Polanco did not even know how to make the traditional Salvadoran fare.