Dish of the Week: Shaved ice dessert Where: Shilla Bakery (Rockville and Annandale), Malaysia Kopitiam, Penang (D.C. and Bethesda) Some of the biggest food trends have had their origins in Asian snack and street food. Stuff like tart frozen yogurt, banh mi, and pork buns have all gained cult-like popularity. Shaved ice may go by many names in Asia, such as patbingsoo, ice kachang or halo-halo, but the premise is always the same. Take…