Toast the ground cinnamon in a small saucepan for a few seconds,
add the milk, dark chocolate, and sugar. Whisk lightly over medium heat until combined and heated through. Pour into a mug.
Whip the cream until it forms soft peaks (this will happen very quickly, so don’t overwhip it or it’ll turn into butter!). Mix in the ginger and sugar until combined, then spoon it onto the hot cocoa and garnish with the fresh orange peel.