Instructions: Mix cornstarch with a little cold root beer until smooth. Heat rest of root beer in a medium-size pot. Heat root beer until it reaches about 90 degrees, chocolate dip temperature on a candy thermometer. (There will be bubbles that rise from the root beer. That is carbonation escaping.)

Stir cornstarch mixture into warm root beer. Continue heating for two minutes, stirring all the while. Then add butter. When it reaches a boil, let mixture boil for one minute. Then take it off the stove, and serve the butterbeer in mugs.

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