A Margarita is tequila, lime, and orange liqueur. A Daiquiri is rum, lime, and sugar. A Whiskey Sour is bourbon, lemon, and sugar. A Sidecar is cognac, lemon, and orange liqueur.

Those are not four recipes. That is one recipe, poured four times, with different bottles.

Sours are the largest family in the cocktail canon and the best one to learn first, because the skill they teach, balancing sweet against sour, is the skill every other family borrows. Get this one template into your hands and you can make a dozen classics from memory and invent more.

The template

The shape almost every sour follows:

2 oz spirit · 1 oz citrus · ¾ oz sweetener. Shaken hard with ice, strained into a chilled glass. About 4½ oz in the glass once dilution is counted.

That is it. Bartenders write it as 2:1:¾, and once it is in your head you never need a Margarita recipe again.

A few notes on why those numbers and not others. The spirit is doubled against the citrus because citrus is aggressive; equal parts would taste like sharp juice. The sweetener sits under the citrus rather than matching it because sugar's job is to round the acid off, not to cancel it. A sour that tastes like lemonade has too much sweetener. A sour that makes you wince has too little.

Treat ¾ oz as a starting point and move it, not the other two. Sweetness is the dial with the most personal variance, and it is the one you should be adjusting to the fruit in front of you. Limes in February are not limes in July.

The same drink, twelve ways

Every one of these is 2:1:¾ with different bottles in the slots.

• Daiquiri. White rum, lime, simple syrup. The purest expression of the template, and the drink professionals order to judge a bar.
• Margarita. Tequila, lime, orange liqueur. The sweetener happens to be alcoholic, which is why it drinks stronger than it reads.
• Whiskey Sour. Bourbon, lemon, simple syrup. Add egg white and it becomes a Boston Sour.
• Sidecar. Cognac, lemon, orange liqueur. The Margarita's older, more formal cousin.
• Gimlet. Gin, lime, simple syrup. Traditionally lime cordial, which is why versions vary so widely.
• Cosmopolitan. Citrus vodka, lime, orange liqueur, with cranberry for color and a little tartness.
• Pisco Sour. Pisco, lime, simple syrup, egg white, bitters on top.
• Bee's Knees. Gin, lemon, honey syrup. Proof that the sweetener slot is wide open.
• Southside. Gin, lime, simple syrup, mint. A Daiquiri that went to the garden.
• Amaretto Sour. Amaretto, lemon, and usually a little bourbon to keep it from being dessert.
• Paper Plane. Equal parts bourbon, Aperol, amaro, lemon. A modern classic that bends the ratio and still belongs here.
• Clover Club. Gin, lemon, raspberry syrup, egg white. A sour in a dress.

Read that list again and notice how little separates them. Twelve famous drinks, three slots, and the only real variables are which spirit, which citrus, and which sweetener.

The shake is not optional

Sours are shaken, and stirring one produces something noticeably worse. Three things happen in the tin that the drink needs:

Chilling. Fast and hard, which citrus drinks need more than spirit-forward ones because cold suppresses the perception of sourness.

Dilution. About a quarter of the finished drink is melted ice. That water is an ingredient. It is why 3¾ oz of liquid becomes 4½ oz in the glass, and why an under-shaken sour tastes like its parts standing next to each other rather than one drink.

Aeration. Shaking whips air in, which is what gives a good sour its slightly frothy top and lighter body.

Shake harder and shorter than feels natural: twelve to fifteen seconds with plenty of ice, until the tin is too cold to hold comfortably. If you are using egg white, shake once without ice first to build the foam, then again with ice to chill it. That order matters more than any other technique in this article.

Where sours go wrong

Bottled citrus. The single biggest quality gap in home cocktails. Bottled lemon and lime juice are cooked and preserved, and they taste it. Fresh juice oxidizes within hours, which is precisely why the bottled stuff cannot taste the same. If you change one thing after reading this, change this.

Sweetener that is actually granulated sugar. Sugar does not dissolve in cold liquid. Use simple syrup, equal parts sugar and hot water, cooled. It keeps for weeks and takes four minutes to make.

Small or wet ice. Ice that has been sitting in the freezer tray dilutes too fast and chills too slowly, which is the exact opposite of what you want. Fresh, big, dry cubes.

Not tasting before straining. Every batch of citrus is different. Taste from the tin with a straw before it hits the glass, and adjust the sweetener while you still can.

Serving warm. A chilled glass buys you several minutes of the drink staying the way you made it. Fill it with ice water while you shake, then dump it.

How to invent one

This is the payoff of learning a template rather than a recipe. Hold 2:1:¾ still and change one slot at a time.

Change the spirit. The safest move and the one that produces most of the classics. Swap tequila for mezcal and a Margarita becomes smoky. Swap rum for cachaça and a Daiquiri drifts toward a Caipirinha.

Change the sweetener. The most underrated slot. Honey syrup, maple, orgeat, demerara, raspberry, ginger syrup. Each one takes the drink somewhere different without touching the balance, because the volume stayed the same.

Change the citrus. Lemon reads brighter and more floral, lime rounder and more assertive. Grapefruit is softer and needs less sweetener. They are not always interchangeable, so change this one last.

Add texture or bitterness. Egg white for body, a few dashes of bitters for depth, a herb clapped between your palms for aroma. These sit on top of a balanced drink; they do not fix an unbalanced one.

The rule that keeps this from going wrong: change one slot per attempt, and taste before you decide. Two changes at once and you will not know which one worked.

FAQ

What is a sour cocktail?
A sour is any cocktail built from spirit, citrus, and a sweetener, shaken with ice. The classic ratio is 2 oz spirit to 1 oz citrus to ¾ oz sweetener. Margaritas, Daiquiris, Whiskey Sours, and Sidecars are all sours.

What is the ratio for a sour cocktail?
2:1:¾, meaning two parts spirit, one part fresh citrus, three-quarters of a part sweetener. Adjust the sweetener to taste and to the fruit; leave the other two alone until you know the drink.

Why is my sour cocktail too sour?
Usually not enough sweetener, or not enough dilution. Add sweetener a quarter ounce at a time, and check that you shook long enough with fresh ice. Under-shaking is the most common cause of a drink that tastes harsh.

Do you shake or stir a sour?
Always shake. Citrus, sugar, and any egg or dairy need the aeration and the fast chill that shaking provides. Stirring is for drinks made entirely of spirits.

Is a Margarita a sour?
Yes. Tequila, lime, and orange liqueur is the sour template with an alcoholic sweetener in the third slot, which is why a Margarita drinks stronger than its size suggests.

MixKings keeps your recipes filed by family, so the sour you invented on Friday is still findable in December.