Cao Lầu is a noodle dish with deep historical roots that can be enjoyed near The Top Bar. It's characterized by its chewy noodles, which are similar in texture to Japanese udon. The dish is served with slices of barbecue pork, fresh greens, bean sprouts, and a flavorful broth. What makes Cao Lầu distinctive is the ash water from lye cigarettes used during the preparation of the noodles, as well as the crunchy squares of deep-fried noodles used as a topping. It's a unique representation of the cultural melding of flavors in Vietnam.