Bia Hoi is not a cocktail in the traditional sense, but it is a must-try drink when in Hanoi. Bia Hoi is a type of draft beer that is brewed daily and served fresh at local bars and street-side establishments. It is a light and refreshing beer with a low alcohol content, making it perfect for enjoying on a hot day. Bia Hoi is best enjoyed with friends, as it is often served in large quantities and is a popular choice for socializing in Hanoi.