3/4 to 1 cup cold root beer
3 small scoops vanilla ice cream
about 3/4 cup cold club soda (optional)
Fill a tall glass about 1/3 full with root beer. Add 1 scoop ice cream. Pour in about ¼ 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 a little extra carbonation, if desired.