Fortune cookies are cookies of American origin and crispy, usually prepared with flour, sugar, vanillin and oil. Inside the sweets are hidden the "fortunes", that is small pieces of paper that bear motets and prophetic or divine phrases. In the United States and Canada (as in other parts of the Western world) it is usually served as a dessert in Chinese restaurants. Inside messages can also include a list of lucky numbers (used by some, such as lottery numbers) or a phrase with Chinese translation or a rule to follow for a success in a given field. The exact provenance of fortune cookies is unclear, but various immigrant groups in California claim to have advertised the product in the early 20th century, basing their recipe on that of traditional Japanese crackers.