The daiquiri recipe rum, lime, and a touch of sweetness is one of the most popular templates for mixologists to riff on, and for good reason. Its a well-balanced sour that stands up to the addition of new flavors, and the apple daiquiri from john deragon in the pdt cocktail book is a perfect example. Youll need an apple liqueur with some backbone. Were huge fans of berentzen apfelkorn, or really any german apple schnapps. But it would even work with a lowbrow apple pucker-type schnapps, though itd be a good deal sweeter; if you go this route, you may want to pull back a bit on the simple syrup.