Whiskey Sour
The Whiskey Sour is one of the oldest documented cocktails in the American canon, printed in Jerry Thomas’s 1862 bar guide, and its structure of whiskey, fresh lemon and sugar is the template every other whiskey sour derives from. The Honey Sour changes the sweetener. The Penicillin changes the sweetener and the technique. The Amaretto Sour changes the base spirit. Understand this drink and the whole family becomes readable. The egg white question matters more here than in most sours, because both versions are widely ordered and both are correct. With it, the drink is a Boston Sour: silky, with the foam carrying the bourbon’s vanilla to the nose before the lemon reaches the palate. Without it, sharper and more direct. Pre-made sour mix has shown a generation this drink at its worst. Built with lemon squeezed to order, a decent bourbon and a properly proportioned syrup, it surprises almost everyone whose expectations were formed by the imitation.
Variations
Glassware: Rocks Glass
Garnish: Maraschino Cherry, Orange Slice and Angostura Bitters pattern
Ingredients
45ml
A bourbon with genuine vanilla and caramel character performs best here. Rye produces a drier, spicier result, and both are correct: the choice is preference rather than convention.
25ml
Squeezed immediately before use, and the single most consequential variable in the drink. Bottled juice produces a flat, dull result that no quality of bourbon can compensate for.
20ml
One part white sugar in one part warm water. The balance here runs tart rather than sweet, and the syrup should support the lemon without softening it into something cloying.
Few drops (optional)
Strongly recommended. Dry shaken alone first, then again with everything, then with ice. The foam carries the bourbon’s vanilla and grain to the nose before the acid arrives.
Instructions
Squeeze the lemon juice immediately before building the drink.
Add the egg white to the shaker alone and dry shake vigorously for 15 seconds.
Add the bourbon, lemon juice and simple syrup to the same shaker.
Dry shake everything together, still without ice, for a further 15 seconds.
Add cubed ice and shake hard for 12 seconds.
Strain over fresh ice in a rocks glass, or double strain into a chilled coupe.
Dot the Angostura onto the surface of the foam in a pattern immediately before serving.
Garnish with an orange slice and a cherry, and serve straight away.
Source: the IBA (Official IBA specification; method ours). Last checked 13 August 2026.
Expert Tip
The double dry shake is what separates a good foam from a great one. Shake the egg white alone for fifteen seconds before anything else joins it, which starts the protein work at its most efficient with no fat or acid in the way. Then add everything else and go a further fifteen seconds dry, then ice and twelve seconds hard. Thirty seconds of combined dry shake produces a more stable and more voluminous foam than a single dry shake ever will. Then the bitters. Three drops dotted onto the surface immediately before serving, and they are not decoration: they are the final aromatic adjustment, bridging the whiskey and the lemon at the nose before either reaches the mouth.
Flavour Profile
The Origin
The Whiskey Sour appeared in Jerry Thomas’s How to Mix Drinks, or the Bon Vivant’s Companion in 1862, making it one of the earliest documented cocktail recipes there is. Thomas’s version was whiskey, fresh lemon juice and sugar, the foundational sour template that has since been applied to every spirit category in existence.
The egg white that defines the Boston Sour variation arrived later, as the technique became standard in the shaken sour tradition. The drink’s survival across Prohibition, the mid-century decline and the contemporary revival is a measure of how well the original balance was conceived. Very few recipes hold up across a century and a half without adjustment.
The Sour Template
This drink demonstrates the three-variable logic of the sour format more clearly than any other: base spirit, fresh citrus and sweetener, each at a volume that lets the spirit lead while the acid-sweet frame keeps it approachable.
Almost every sour is a variation on those three slots. Change the sweetener and you have a Honey Sour. Change the sweetener and the technique and you approach a Penicillin. Change the base spirit and you have an Amaretto Sour or a daiquiri, depending how far you go. All of them become legible as variations once this one is understood, which is the argument for learning it first and properly.
Bourbon Versus Rye
Bourbon, with its corn sweetness and vanilla warmth, produces a round and immediately approachable sour, where the whiskey’s own sweetness reinforces the syrup without duplicating it. It is the version most people mean when they order one.
Rye produces a drier, more assertive drink. Its pepper provides a counterpoint to the lemon that bourbon’s warmth does not, and it suits anyone who wants the whiskey clearly audible over the sweetener rather than blended into it. Both are correct and neither is a compromise. Bourbon is the more commonly ordered; rye is the more interesting to anyone who has tried both.
The Foam and the Bitters
The egg white foam concentrates bourbon's dominant aromatics at the surface, so a Boston Sour smells of vanilla, caramel and grain before it is tasted, and the acid arrives a beat later and softer than it otherwise would.
Bitters dotted over that foam are the common finish and are not in the official specification, which lists whiskey, lemon, sugar syrup and a few optional drops of egg white and nothing else. Added, they contribute a spice layer that bridges whiskey and lemon at the nose, and the pattern is the last thing done. Fresh lemon matters more than either. At 25ml with no modifier to mask degradation, juice squeezed to order and juice that has sat since the start of service are two different drinks, and the freshness standard is not negotiable.
How to Serve It
Shaken with a committed dry shake and strained over fresh ice in a rocks glass, or double strained into a chilled coupe, with the bitters dotted over the foam and an orange slice and a cherry alongside.
The rocks glass is the more common contemporary serve and the more forgiving one; the coupe presents the foam at its most stable and is worth the extra care. Serve it to anyone who has never had one made properly, and to anyone who already knows what a good one tastes like. The first group will be surprised and the second will be satisfied.
The Spirit
Whiskey (Bourbon)The only major whiskey required to use a barrel once. New charred oak is the rule that defines bourbon, gives it its sweetness and colour, and incidentally supplies most of the world's Scotch and rum with somewhere to age.
Frequently Asked Questions
What is a Whiskey Sour?
Bourbon, fresh lemon juice and sugar, shaken and served over ice or up, usually with an egg white. It is the foundational sour template, documented in Jerry Thomas’s 1862 bar guide, from which most other whiskey sours derive.
What is a Boston Sour?
The egg white version of the same drink. The foam carries the bourbon’s vanilla and caramel to the nose before the lemon reaches the palate, and the acid lands softer as a result. It is the recommended build here, chosen rather than assumed.
Bourbon or rye?
Both are correct. Bourbon rounds the drink with corn sweetness and vanilla; rye runs drier and spicier, keeping the whiskey clearly audible over the syrup. Bourbon is more commonly ordered, rye the more interesting once you have tried both.
Why dry shake twice?
Because it makes a better foam. Shaking the egg white alone starts the protein work with no fat or acid in the way, and the second dry shake builds volume before ice chills everything down. Thirty seconds combined beats one long shake every time.
Master the Techniques
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Honey Sour
The Whiskey Sour is one of the most accommodating formats in the canon, because its three-ingredient structure takes sweetener variations that produce meaningfully different drinks rather than mere substitutions. The Honey Sour is the most instructive of them. Replacing simple syrup with honey syrup changes the texture, the aromatic character, the mid-palate weight and the relationship between the bourbon and the lemon, which is enough to justify a separate entry rather than a footnote. Honey brings a floral, slightly waxy sweetness with genuine botanical depth that simple syrup does not possess, and it interacts with the vanilla and caramel of a good bourbon in a way that makes the pairing taste considered rather than incidental. The egg white is optional here as it is in the parent, and the decision changes the drink considerably. With it the Honey Sour is silky and rounded; without it, sharper and more directly tart. Both are correct.
Penicillin
The Penicillin was created by Sam Ross at Milk & Honey in New York in 2005 and is one of the most significant original cocktails of the contemporary revival. Ross also created the Paper Plane; the Penicillin is the more complex and more demanding of the two. The structure is a whisky sour built on blended Scotch, sweetened with honey syrup and given its heat by fresh ginger shaken in alongside it, with a float of Lagavulin 16 over the surface. Honey and ginger together define the drink's character, combining floral sweetness with a sharp, spiced bite. The blended Scotch supplies the base, and the float supplies the peated smoke that the blend alone could not deliver at the volume a balanced sour requires. The float is the technique most commonly misapplied. Poured correctly it sits as a distinct aromatic layer, met at the nose and on the first sip before integrating gradually into the drink below.
Amaretto Sour
The Amaretto Sour has a reputation problem that is entirely the fault of the versions most people have encountered. The standard bar version, amaretto and sour mix from a gun or bottled lemon juice, is sweet, flat, and devoid of the complexity a properly built version achieves. That gap has led many serious drinkers to write the drink off entirely, which is a mistake worth correcting. The version documented here builds on the approach developed by American bartender Jeffrey Morgenthaler, who recognised that amaretto’s lower ABV and high residual sweetness require structural support from a higher-proof spirit. Cask-strength bourbon at 22.5ml provides that support without dominating the amaretto’s almond and stone fruit character: its proof adds structural weight, its vanilla and caramel complement the amaretto’s sweetness, and its spice provides a counterpoint that stops the drink becoming one-dimensional. Egg white is optional in deference to those who prefer to avoid it, but it is strongly recommended here. With it, the foam carries the amaretto’s almond aromatics at the nose before the lemon acid and bourbon spice arrive at the palate, and that sequence is what the drink is designed to deliver.
Where this one sits
Recipe by Jerry Can Spirits
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