I found this recipe called "Chocolate of the Aztecs". Digging into the history of chocolate, found out that indeed according to one version, the inventors of the chocolate drink was just the Aztecs, but the pepper was unknown in the New world before the conquest by Spain. Therefore, this drink may not have traditionally Aztec roots. So pepper left, a name change and offer you very tasty and spicy drink. Do not be afraid of the presence of hot pepper, all danger disappears (thanks to the milk, apparently), but remains a very interesting velvety taste.