@benhamill
Hot chocolate is spiced, so you can't make it with that since it would just be hot chocolate milk.

According to sister (@TallTallAlex) who knows a lot about food, you use cocoa powder, honey, brown sugar, and cinnamon. Adding cardamom is a nice touch. (Her recipe.)

So I guess you would mix cinammon with the chocolate syrup first? (So it doesn't get all clumpy.)
Then heat it in a sauce pan with a little milk and add more as you stir.