The gin sour is a study in balance: tart lemon, gentle sweetness, botanical gin, and a velvet cap of foam. Home bartenders often miss the mark because the ratios are off or the foam never appears. Here is the standard formula that works every time: 2 ounces gin, ¾ ounce fresh lemon juice, ¾ ounce simple syrup, and 1 fresh egg white. Dry-shake first, then shake with ice, strain into a coupe, and garnish with a few drops of Angostura bitters or a lemon twist.
Why This Ratio Works
The classic sour template calls for two parts spirit, one part sour, one part sweet. Here that means 2 ounces gin to ¾ ounce lemon juice and ¾ ounce simple syrup. The 1:1 sour-sweet ratio keeps the drink bright without puckering. The egg white (about ½ ounce) adds body and a thick, lasting foam. If you prefer a drier or sweeter sour, adjust the simple syrup by ¼-ounce increments. Use a 1:1 simple syrup (equal parts sugar and water by volume) for consistent sweetness.
Essential Ingredients
- Gin: A London dry gin works best. Its juniper-forward profile stands up to lemon and sugar. Old Tom gin will make a softer, slightly sweeter sour.
- Fresh lemon juice: Bottled juice lacks brightness. Roll the lemon on the counter before juicing to release more juice.
- Simple syrup: Make your own by dissolving 1 cup sugar in 1 cup hot water. Cool before using. Store in the fridge for up to two weeks.
- Egg white: One large egg white is about 1 ounce. For safety, use pasteurized eggs if you are concerned about consuming raw egg. The FDA advises that raw eggs may contain Salmonella; verify handling guidance through an official source.
- Angostura bitters (optional but classic): A few drops on top add aroma and a decorative pattern.
Tools You Need
- Cocktail shaker (Boston or cobbler)
- Jigger or measuring cup
- Hawthorne strainer
- Fine-mesh strainer (optional, for removing ice shards)
- Coupe glass or stemmed cocktail glass
Step-by-Step Method
1. Dry-Shake
Add the gin, lemon juice, simple syrup, and egg white to your shaker without ice. Close tightly and shake vigorously for about 15 seconds. The egg white needs the friction of shaking without ice to emulsify and create foam.
2. Wet-Shake
Open the shaker, add a generous scoop of ice, and shake again for another 10–15 seconds. The ice chills and dilutes the drink slightly while the foam structure is already set.
3. Strain
Double-strain through a Hawthorne strainer and a fine-mesh strainer into a chilled coupe. This catches any small ice particles that could water down the foam.
4. Garnish
Let the foam settle for a few seconds. Then hold a dropper or a bar spoon with bitters just above the surface and carefully dot 4–5 drops onto the foam. Drag a toothpick through the drops to create a swirl or leaf pattern. Alternatively, express a lemon twist over the drink and drop it in.
Common Mistakes and How to Avoid Them
| Mistake | Cause | Fix |
|---|---|---|
| Drink is too tart | Too much lemon or not enough syrup | Rebalance with a touch more simple syrup next time. |
| Drink is too sweet | Too much syrup or weak lemon | Add a splash of lemon juice. |
| No foam / foam disappears quickly | Skipped dry shake; old egg white; dirty shaker | Always dry-shake at least 15 seconds. Use a fresh egg. Make sure your shaker is clean. |
| Foam is thin or watery | Too much ice in the wet shake; over-dilution | Use a standard scoop of ice (about 4–5 cubes) and shake no longer than 15 seconds. |
| Bitter taste | Over-shaking with ice (releases tannins from lemon pith); or egg white not fresh | Strain thoroughly; use fresh egg. |
Sensible Variations
- Aquafaba sour: Replace egg white with 1 ounce aquafaba (chickpea can liquid). Dry-shake the same way. The foam is slightly less stable but works for a vegan option.
- Flavored syrup: Swap plain simple syrup for rosemary or honey syrup. Reduce to ½ ounce if the syrup is very sweet.
- Different citrus: Substitute half the lemon with lime or grapefruit for a sour that changes character.
- Improved gin sour: Add ¼ ounce dry curaçao or maraschino liqueur for a more complex sour.
When to Serve
A gin sour works as a pre-dinner aperitif or a bright afternoon drink. Serve it in a stemmed glass so the foam stays stable. It is best consumed immediately after shaking; the foam will begin to dissipate after 5–10 minutes.
Further Reading
No external sources were provided in the research package. For authoritative guidance on egg safety, consult the FDA or your local food safety agency.
Yield: 1 cocktail
Glass: Coupe
Method: Dry shake then wet shake
Difficulty: Easy
