Black Cow
["6 oz. root beer, chilled", "3 small scoops (about 3/4 c.) vanilla ice cream", "chilled soda (optional)"]
["Fill a 14-ounce glass 1/3 full with root beer.", "Add 1 scoop ice cream.", "Pour in about 1/4 cup more root beer.", "Add 2 more scoops of ice cream.", "Pour in enough root beer to fill glass. Serve with club soda to add for extra carbonation, if desired."]
["root beer", "scoops", "soda"]