Make the hot chocolate: In a sauce pan bring 3/4 cup of water to a boil. Add the cocoa powder and whisk to combine. Reduce the heat, add the milk and bring to a simmer (do not boil) Whisk in the chocolate and sugar, making sure there are no lumps. Whisk often and simmer until the chocolate is melted and creamy about 5 minutes. Remove from the heat and add bourbon to taste. Pour into mugs and top with pillows of whipped cream and nutmeg.