The Tonic Spritzer 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. The recipe calls for a simple mixture of Mexican beer, tonic syrup, and apricot or blackcurrant liqueur to make a lager-based alternative to the refreshing Gin & Tonic.
Add crème de cassis and tonic syrup to a shaker.
Fill shaker with cubed ice.
Shake for 10-20 seconds.
Add fresh cracked ice to a lowball glass.
Using a Hawthorne strainer, strain into lowball glass.
Top with beer.