INGREDIENTS
1/2 cup
unsalted butter
1 cup
milk
1 1/2 cups
Guinness draught (1 whole 11.2 fl oz bottle)
1 cup
flour
1/2 cup
cocoa powder
4
eggs separated
1/8 tsp
white vinegar
1 3/4 cups
confectioners sugar
1 tsp
vanilla extract
Extra cocoa powder for dusting on top