Today we celebrate cocoa powder of all varieties. Cocoa comes from the bean of the cacao tree. The trees grow in many parts of the world, but the earliest known cultivation of cocoa was in the Amazon, where archaeologists have found evidence of its use dating back to 1900 BC. More famously, the Mayans were known to have used the cocoa bean as food, and currency in fertility rites, while the Aztecs ground it into a bitter drink. Both cultures believed cocoa to be linked to the gods, but it wasn’t until the 1700s that the taxonomer Linnaeus aptly named the source of cocoa beans Theabroma Cacao, meaning "gift of the gods." Less sweet than some, these crinkle cookies are absolutely loaded with cocoa and just a hint of rum flavor. Because the cookies are made with baking powder, I make these with Dutch-processed cocoa and get fat, fudgy cookies every time.