PeruMedium · Chilled
The Kombucha Sour
A bright, effervescent Andean sour that marries fermented kombucha with the herbal warmth of aguardiente, balanced with fresh lime and honey, finished with a silken egg-white foam.
Prep
10 min
Total
10 min
Method
1
Roll the lime firmly on the counter to release the juices, then cut in half. Squeeze both halves through a manual citrus press and strain the juice through a fine sieve into a small bowl. Set aside 1 oz of fresh lime juice.
2
3
Fill the shaker with ice cubes. Add the kombucha and aguardiente. Seal and shake hard for 15–20 seconds until the exterior of the shaker turns frosty and the cocktail is thoroughly chilled.
4
Double-strain through a fine mesh strainer into two chilled coupe glasses, pouring slowly to preserve the foam layer on top. Garnish each glass with a fresh mint sprig and serve immediately.
Grade pending
Nutri-Score
Estimated nutrition
Grade pending · 90% ingredient coverage
Calories
66
per serving
Protein
7g
Carbs
10g
Fat
0g
Sodium
149mg
Dairy FreeGluten FreeLow FatLow SodiumHeart HealthyLow CalorieModerate Protein
Nutri-Score is a general nutritional-balance guide, not medical or dietary advice.
A
Environmental impact
Very low impact
A–E · lower is better · includes estimates
kg CO2e
0.3
per serving
ACarbon
Kombucha drives 55% of this recipe’s estimated footprint.
Carbon from Poore & Nemecek 2018; water, land & runoff from Agribalyse — modelled averages for comparing recipes, not a measurement of your groceries.
Flavor Profile
3
Umami
5
Sweet
1
Salty
6
Sour
3
Bitter
3
Spicy
Textures
EffervescentLightSilky
Aromas
CitrusFermentedFloralHerbal
Kitchen Equipment
Primary Tool
Cocktail ShakerTechniques
Citrus PressDouble StrainDry Shake
Safety & Storage
High Risk Population
Raw egg whites in the foam present salmonella risk. This cocktail should not be served to pregnant individuals, young children, elderly, or immunocompromised guests.
Handling
Use only fresh, refrigerated eggs and clean equipment. Dry shake thoroughly to ensure proper protein emulsification and reduce bacterial risk.
Cross Contamination
Prevent cross-contamination by using sanitized shaker, strainer, and glassware. Never let raw egg mixture contact surfaces that will touch other ingredients.
Storage
Store raw egg whites refrigerated at 40°F or below. Use within 24 hours of separation. Discard any foam that sits at room temperature for more than 2 hours.
Shelf Life
Prepare egg foam immediately before serving. Do not prepare ahead as the foam collapses quickly and bacterial risk increases over time.
Drug Interaction
Aguardiente contains alcohol. Warn guests about alcohol consumption risks and interactions with medications, especially antibiotics and sedatives.
Cooking Temperature
Ensure all equipment including shaker and glasses are thoroughly chilled before use. Serve immediately once prepared to maintain foam stability.
Pro Tips
Technique
The dry shake is sacred technique—do not rush it. Twenty seconds of vigorous shaking without ice emulsifies the egg white proteins into that characteristic silky microfoam that floats rather than sinks. If your foam collapses, your next batch needs more commitment in this first shake.
Substitution
If you cannot find aguardiente, a clear Peruvian pisco quebranta offers a worthy alternative, though you will lose the subtle anise character that defines this drink's soul. The honey may be replaced with algarrobina syrup for deeper Andean authenticity.
From the chef
Kombucha brings a living acidity to this sour that lime juice alone cannot replicate — together they create a layered brightness that meets the herbal warmth of aguardiente in an interesting balance. Honey rounds the edges without pushing toward sweetness. The egg white, dry-shaken first for a full twenty seconds until pale and frothy, builds the microfoam that defines this cocktail's texture: silken, stable, and slightly airy. Double-strain into chilled coupes, pour slowly to preserve the foam layer, and finish with fresh mint. It is a technically precise drink that rewards attention.
TagsPeruvianAndean SourEffervescentHerbal FlavourEgg White FoamCitrusFermented FlavourChilledQuick PrepAperitifCraft Cocktail
AllergensEggs
Source: generated · June 13, 2026