Instructions

1. In a large bowl, mix together the chocolate and cocoa powder.
2. In a small saucepan, bring 2 cups of milk to a simmer over medium heat.
3. Pour warm milk over chocolate and whisk well until chocolate is melted. Add remaining milk and cream, then set aside.
4. In a standing mixer, place egg whites in the large mixing bowl. Then whisk on low until frothy, about 30 seconds.  
5. Increase the speed to medium and beat until the egg whites are thick and frothy, about 90 seconds.
6. With mixer running, slowly stream in half the sugar and beat until incorporated, about 30 seconds. Place the beaten egg whites in a large bowl and reserve.
7. Place the bowl back on the standing mixer. Add egg yolks and remaining sugar. Whisk at medium speed until yolks are thickened and pale yellow, about 1 minute. Lower speed to low, slowly add milk/chocolate mixture and whisk until fully incorporated, about 1 minute.
8. Add bourbon and mix until combined.
9. Using a spatula, gently fold egg whites into chocolate mixture.
10. Pour into glasses and serve garnished with shaved chocolate and grated nutmeg.