Butter instead of milk? The idea behind Bulletproof Coffee

Coffee can be enjoyed in countless ways: black or with a splash of milk, with or without sugar, sometimes even sweetened with syrup. So why not with a dash of butter? What initially sounds like a culinary oddity has long been known as Bulletproof Coffee— or simply butter coffee—and is anything but new. At its core, it’s coffee blended with unsalted organic butter, ghee (clarified butter), or a small amount of MCT oil (a type of fat composed of medium-length carbon chains) instead of milk.