I was introduced to these as a very young child and have always loved them. These days I seldom think of making them, but when I do--wow, what a treat! My black cow is made with Coke--not Pepsi, not root beer. Coca Cola, because it has just the right amount of fizz.
Photo by: videojug.com/...w-to-make-coke-float
In a tall glass place three or four scoops ice cream, one at a time, alternating with pouring Coke over each scoop. Place a scoop of ice cream, pour a little Coke over it, and repeat until glass is full.
Be sure the Coke has been refrigerated and is very cold. This will make little ice crystals on the ice cream and make it all the more yummy! Enjoy!