In a saucepan, bring the stout to a simmer (and not bubble over) over medium-high heat, about 10 minutes or until it is reduced to about 3/4 of a cup. Remove from the heat and set aside
In a separate saucepan, warm the milk over medium heat and not to bring it to a boil. Add in chocolate and sugar; and stir until all the chocolate is melted. Remove from the heat and mix with the reduced bver
Divide the ice cream between 2 mugs and pour the stout beer hot chocolate over