Chocolate Milkshake Day is celebrated on September 12th of each year. A milkshake is a sweet, cold beverage which is usually made from milk, ice cream or iced milk, and flavorings or sweeteners such as fruit syrup or chocolate sauce. Outside the United States, the drink is sometimes called a thickshake or a thick milkshake or in New England, a frappe, to differentiate it from other less-viscous forms of flavored milk.
Full-service restaurants, soda fountains, and diners usually prepare and mix the shake “by hand” from scoops of ice cream and milk in a blender or drink mixer using a stainless steel cup. Many fast food outlets do not make shakes by hand with ice cream. Instead, they make shakes in automatic milkshake machines which freeze and serve a premade milkshake mixture consisting of milk, a sweetened flavoring agent, and a thickening agent. However, some fast food outlets still follow the traditional method, and some serve milkshakes which are prepared by blending soft-serve ice cream (or ice milk) with flavoring or syrups. A milkshake can also be made by adding powder into fresh milk, and stirring the powder into the milk. Milkshakes made in this way can come in a variety of flavors, including chocolate, strawberry and banana.