Sours

Whiskey Sours and Amaretto Sours On Tap — Foam Without the Egg

The foam is what makes a sour, and it’s the hardest part to get right for a crowd. A few drops of Wonderfoam and a hit of nitrous oxide put a silky head on every glass — no egg whites, no dry-shaking.

Shop the Cocktail Keg BundleGet the sour recipes
  • Vegan-friendly foam
  • No dry-shaking
  • Cold for 10+ hours
  • 8,200+ reviews
Sour Cocktails On Tap

Everything for a foamy sour

Cocktail Keg Bundle - With Gas & Accessories
From $269

The keg, tap, regulator and gas you need to batch and foam sours.

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Wonderfoam| Cocktail Foam Stabiliser | 50ml
$34.95

Made from quillaja bark. A 50ml bottle foams more than 200 cocktails, and it’s vegan.

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8g Pure Nitrous Oxide | Nitro Coffee Etc | 10 Pack
$12.95

Nitrous oxide whips the foam as the sour pours. The recipe book shakes sours at 30 psi.

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Sour cocktail essentials

Why sours suit a keg

Foam on demand

Nitrous oxide and Wonderfoam create the head as you pour.

No raw egg

Use Wonderfoam or chickpea water (aquafaba) instead of egg whites.

Fresh citrus, batched once

Juice the lemons once, not for every round.

Consistent balance

Sweet and sour stay in the same ratio from first glass to last.

Buying guide

Batch sour recipes

Whiskey sour (2L keg)

From the iKegger Cocktail Recipe Book:

  • 600ml whiskey
  • 450ml fresh lemon juice
  • 300ml chickpea water (aquafaba) or egg whites
  • 300ml water
  • 150ml sugar syrup
  • 3–6 drops of Wonderfoam

Gas with nitrous oxide and shake at 30 psi. Serve over ice with a maraschino cherry.

Amaretto sour

Use the same method with a popular ratio of 3 parts amaretto, 2 parts lemon and 1 part bourbon (the bourbon cuts the sweetness). For a 1L keg: about 450ml amaretto, 300ml lemon, 150ml bourbon and 100ml water, plus Wonderfoam.

Pisco sour

A common ratio is 4 parts pisco, 2 parts lime and 1½ parts sugar syrup, plus a foaming agent. Batch it as above and finish each glass with a few drops of Angostura bitters on the foam.

Egg white, aquafaba or Wonderfoam?

Egg white gives the classic texture but doesn’t keep well and isn’t vegan. Aquafaba (the liquid from a tin of chickpeas) and Wonderfoam are both vegan, and Wonderfoam needs only a few drops per keg.

Please enjoy alcohol responsibly. Kegs ship empty and we don’t sell alcohol.

Questions

Frequently asked

How do you make a whiskey sour without egg?

Use Wonderfoam or aquafaba instead of egg white. In a keg, nitrous oxide whips the foam as it pours.

What is in an amaretto sour?

Amaretto, fresh lemon juice and sugar syrup, often with a splash of bourbon and a foaming agent.

How long does a batched sour keep?

Because of the fresh citrus, it’s best within a day or two. Keep the keg cold.

How much Wonderfoam do I need?

Three to six drops per keg, as in the recipe book. One 50ml bottle covers more than 200 cocktails.

The perfect foam, every pour

Batch your sours once and let the gas do the shaking.

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