Two kinds of cinnamon plus cocoa equals the best cinnamon hot chocolate (or cinnamon hot cocoa) you've ever had. Rich, complex, and satisfying.
Combine the sugar, cocoa powder, cinnamon, and water in a small saucepan. Heat over medium low heat, whisking briskly, until combined into a smooth and glossy liquid, about 2 minutes.
Slowly whisk in the milk until fully incorporated and slightly steaming (don't boil!). Serves four.
Ground cinnamon labeled just "cinnamon" is made from cassia cinnamon bark. This is the first cinnamon called for in the ingredients. The second type of cinnamon will be labeled "Ceylon" cinnamon, which has a different flavor from cassia cinnamon.