I'm going to be completely up front here, I stole this whole recipe from Alton Brown. Well, almost. I cheated and used eggnog I bought from the store because I'm not Alton Brown. And I made it chocolate. And I used a different (and more) booze. And I'm lazy and I didn't have time for homemade eggnog because a couple of friends stopped by with a bottle of what they called "bourbon" that was actually a bourbon liqueur called Sweet Lucy.