For many people, the word "daiquiri" evokes the vision of frozen concoctions, usually in some sort of fruit flavor (strawberry, banana, etc). These drinks populate beaches and other vacation spots, leaving the "old-school" daiquiri out of the mix.
I remember the first time I realized that there was more to the daiquiri than the adult slushie. The person who informed me was no other than Agatha Christie, in her story The Mirror Crack'd from Side to Side, in which the murder weapon was a poisoned daiquiri. Of course, I was a bit confused, since Brits are not too keen on ice. I just chalked it up to the fact it was an American (the fictional actress Marina Gregg) who prefered the drink. Then I binged all of the BBC and ITV adaptations of Agatha Christie's Miss Marple novels and, there it was, a lightly citrus-tinged colored liquid served straight up in a martini glass (see images below, from Agatha Christie's Miss Marple: Season 5, Episode 4). The classic daiquiri.
I discovered the ingredients in my copy of Vintage Cocktails: 1 1/2 oz. light rum, 1 oz. simple syrup, and 3/4 oz. fresh lime juice. However, I did make a few changes to the ratio as listed (I upped the lime juice to a full 1 oz because the local rum I used (by Yahara Bay) needed a little more acid). My advice is to start with the listed ratio and play around according to your taste.
Directions were simple: "shake all the ingredients with ice and strain into a small cocktail glass."
However, they suggested to fill the glass with fresh ice - which is the other step I deviated from in terms of the recipe and directions.
I prefer my cocktails neat, and in Miss Marple the daiquiris were served neat in martini glasses after all.
I chilled a glass in my freezer for a few minutes. Then strained the shaker contents into the glass. As pictured, you can drink it as is or if you prefer, add a bit of lime or lime peel as a garnish.