Quesillo in Nicaragua is both an ingredient (string cheese), and a street food dish made of the quesillo cheese, handmade corn tortilla, pickled onions with local sour cream. The smoothness of the cream combined with the acidity of the pickled onions, and a little bit of salt at the end, is enough to make your mouth water. This is an economical option that you'll find at El Pipe, a little restaurant outside Managua that specializes specifically in in this delightful dish.