phở tái bò viên, thin slices of raw beef, usually tender cuts like eye of round, are added to the hot broth just before serving. The residual heat from the broth gently cooks the beef to a tender, medium-rare perfection, ensuring it remains flavorful and succulent.
Alongside the rare beef slices, beef meatballs ("bò viên") are also added to the steaming bowl of rice noodles and broth. These meatballs are typically made from finely ground beef mixed with seasonings such as garlic, shallots, and fish sauce, then shaped into small rounds and cooked until tender.
To complete the dish, phở tái bò viên is garnished with fresh herbs like cilantro and green onions, bean sprouts, lime wedges, and chili slices. Diners can customize their bowls with condiments like hoisin sauce and Sriracha according to their taste preferences.