2. Bún bò Huế or bun bo is a popular Vietnamese soup containing rice vermicelli (bún) and beef (bò). Huế is a city in central Vietnam associated with the cooking style of the former royal court. The dish is greatly admired for its balance of spicy, sour, salty and sweet flavors and the predominant flavor is that of lemon grass. Compared to phở or bún riêu, the noodles are thicker and more cylindrical.