The Oatmeal Stout Old Fashioned is a modern cocktail that was created by Jon and Lindsay Yeager in Nashville, Tennessee and was first published in their book The Ultimate Guide to Beer Cocktails: 50 Creative Recipes for Combining Beer & Booze. It uses the familiar Old Fashioned template of whiskey, a sweetener, bitters, and citrus, but this version swaps out most of the simple syrup for oatmeal stout and replaces the classic’s aromatic bitters with walnut bitters.
Add bourbon, bitters, and simple syrup to a mixing glass.
Fill mixing glass with cubed ice.
Using a bar spoon, stir for 30-45 seconds until well-chilled and slightly diluted.
Add fresh cracked ice to a lowball glass.
Using a julep strainer, strain into lowball glass.
Top with beer.
Express orange twist over top of glass.
Garnish with orange twist.