Add the beef to the noodles and ladle the hot broth on top. Drizzle with the sesame oil and top with the basil, cilantro, scallions and bean sprouts. Serve with lime wedges and chile sauce.

The Vietnamese beef noodle soup, pho bo, is difficult to make at home: it requires an enormous pot to hold all the beef bones, meat and spices, which are simmered for hours. Pho gai - chicken ...