Pisco Sour (Pisco 3 to Lime 1 to Syrup 1 to Egg White 0.5)

75 ml (3 parts)

Pisco (Peruvian) — Quebranta grape pisco preferred; non-aromatic varietals let the lime lead

25 ml (1 part)

Fresh lime juice — Always freshly squeezed; bottled juice lacks the volatile aromatics that make this work

25 ml (1 part)

Simple syrup (1:1) — Standard 1:1 sugar syrup; some bartenders use 2:1 and reduce to 15 ml

15–20 ml (0.5 parts)

Egg white — Roughly half of one large egg white; the foam-to-body ratio hinges on this

3 dashes

Angostura bitters — Floated on top of the foam — aromatic punctuation, not blended in

Combine pisco, lime juice, simple syrup, and egg white in a shaker without ice (dry shake for 10–15 seconds to emulsify the egg white and build the foam structure). Add ice and shake hard for another 10–12 seconds to chill and dilute. Double-strain through a fine-mesh strainer into a chilled coupe or rocks glass. The foam rises to the surface on its own — do not stir. Float 3 dashes of Angostura bitters on the foam and swirl once with a toothpick to create the traditional decorative pattern.

• Dry shake first (no ice) to build foam before chilling — this sequence is non-negotiable; ice inhibits emulsification
• Peruvian Pisco Sour traditionally uses Quebranta (non-aromatic) pisco; Italia or Moscatel varietals shift the drink toward floral and can overwhelm the lime
• Foam volume is directly proportional to shake vigor during the dry shake — a lazy shake produces thin, watery foam
• Double-strain with a fine-mesh strainer to remove ice chips that would disrupt the foam cap
• Angostura bitters on the foam are standard in Peru; some Lima bars use Amargo Chuncho (Peruvian bitters) for authenticity
• Egg white carries salmonella risk — use pasteurized egg white for high-volume service; aquafaba is a reliable alternative
• The drink should be served immediately; foam begins to separate after 5–7 minutes

• Chilean Pisco Sour

  Uses Chilean pisco (often Moscatel-based, sweeter and more aromatic); lime sometimes replaced with lemon; no egg white in some regional versions

• Maracuyá Sour

  Passion fruit purée (15 ml) replaces lime juice; popular in Lima bars; reduces simple syrup to 15 ml to compensate for purée's natural sweetness

• Chicha Morada Pisco Sour

  Purple corn chicha replaces the simple syrup; adds earthiness and color

• Aquafaba Pisco Sour

  Chickpea liquid (aquafaba) at the same 0.5-part ratio replaces egg white; nearly identical foam stability for vegan service

• Spiced Pisco Sour

  Cinnamon syrup substituted for plain simple syrup; 1:1 ratio maintained

• Higher-spirit sour (4:1:1:0.5)

  Shift to 4 parts pisco for a more spirit-forward drink; requires a touch more syrup to rebalance

• Whiskey Sour (2:1:0.75)

  Parent sour template; same acid-spirit-sugar logic, egg white optional there but structural here

• Daiquiri (2:1:0.75)

  Closest cousin without egg white; rum instead of pisco

• Simple Syrup 1:1 vs 2:1

  Syrup concentration directly affects how much volume to add and thus the final balance

1. 1.The Joy of Mixology — Gary Regan
2. 2.Perú: The Cookbook — Gastón Acurio
3. 3.Death & Co: Modern Classic Cocktails — David Kaplan, Nick Fauchald, Alex Day
4. 4.Liquid Intelligence — Dave Arnold (emulsification science and dry-shake technique)

Confidence: high