I love a well made Classic Daiquiri. A Classic Daiquiri is not a slushy with fake strawberry or banana artificial flavoring. It is simply Rum, Sugar and Fresh Lime Juice. It should be shaken vigorously with ice then fine strained and served Up.
I also love the variation of this drink called the Hemingway Daiquiri which adds some Fresh Grapefruit and Maraschino Liqueur & omits the sugar.
I made myself a Hemingway Daiquiri recently and was looking at my lovely bottle of Campari. I looked back at my Daiquiri, and then the Campari. You probably know where this is going...I thought, "what happens if you put a little Campari in this drink?" Well, personally I think its great. The tart flavors of the lime and grapefruit, balanced with the sweetness from the maraschino liqueur and the bitter/tart flavor of the Campari produced a complex summer cocktail that I think is awesome. Cheers!
1.5 oz Light Rum
.5 oz Campari
.25 oz maraschino liqueur
.5 oz fresh grapefruit juice
.5 oz fresh lime juice
.25 oz simple syrup
Shake vigorously with ice. Double stain into a Coupe Glass. Cheers!
(As a side note, Philip Green wrote a great book about Ernest Hemingway's relationship with cocktails: To Have and to Have Another. You can here more about this subject in Bartender Journey Podcast #37)