Chocolate is a typically sweet, usually brown, food preparation of roasted and ground cacao seeds. It is made in the form of a liquid, paste, or in a block, or used as a flavoring ingredient in other foods. The earliest evidence of use traces to the Olmecs (Mexico), with evidence of chocolate beverages dating to 1900 BC. The majority of Mesoamerican people made chocolate beverages, including the Maya and Aztecs.The seeds of the cacao tree have an intense bitter taste and must be fermented to develop the flavor. After fermentation, the beans are dried, cleaned, and roasted. The shell is removed to produce cacao nibs, which are then ground to cocoa mass, unadulterated chocolate in rough form. Once the cocoa mass is liquefied by heating, it is called chocolate liquor. The liquor also may be cooled and processed into its two components: cocoa solids and cocoa butter. Baking chocolate, also called bitter chocolate, contains cocoa solids and cocoa butter in varying proportions, without any added sugar. Much of the chocolate consumed today is in the form of sweet chocolate, a combination of cocoa solids, cocoa butter or added vegetable oils, and sugar. Milk chocolate is sweet chocolate that additionally contains milk powder or condensed milk. White chocolate contains cocoa butter, sugar, and milk, but no cocoa solids. Chocolate has become one of the most popular food types and flavors in the world, and a vast number of foodstuffs involving chocolate have been created, particularly desserts including cakes, pudding, mousse, chocolate brownies, and chocolate chip cookies. Many candies are filled with or coated with sweetened chocolate, and bars of solid chocolate and candy bars coated in chocolate are eaten as snacks. Gifts of chocolate molded into different shapes (e.g., eggs, hearts, coins) have become traditional on certain Western holidays, such as Easter, Valentine's Day, and Hanukkah. Chocolate is also used in cold and hot beverages such as chocolate milk and hot chocolate and in some alcoholic drinks, such as creme de cacao. Although cocoa originated in the Americas, recent years have seen African nations assuming a leading role in producing cocoa. Since the 2000s, Western Africa produces almost two-thirds of the world's cocoa, with Ivory Coast growing almost half of that amount.