Bun Rieu Cua is a flavorful Vietnamese crab noodle soup that is popular in Hanoi. It is made with a tomato-based broth, crab meat, tofu, vermicelli noodles, and various herbs and vegetables. The soup is typically garnished with fried tofu, shrimp paste, and lime wedges. Bun Rieu Cua is known for its rich and tangy flavors and is a favorite among seafood lovers in Hanoi.