The Presbyterian is one of those classic cocktails that is subject to interpretation because, despite its simple list of three ingredients, there are many variations.
Some recipes will use ginger ale while others substitute it for 7-up or another other lemon-lime soda. On the base liquor side, one thing is for sure: whiskey is necessary. Whether that whiskey be bourbon, rye, or a whiskey is a matter of personal taste.
What I do like about this mixed drink is that it has just a touch more depth than the classic Highball and this is why I think ginger ale is necessary.
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