Knowledge Base

Tepache

Cultured beverage · Traditional · peer-reviewed

Mexico's pineapple-peel ferment — skins, brown sugar and spice steeped until wild yeast and LAB turn scrap into a tangy, lightly boozy street soda.

Easy to make
2–4 days ferment
live-cultures, organic-acids, light-fizz supplied

Ingredients

  • Ripe pineapple peels and core1 fruit
  • Piloncillo or brown sugar100 g
  • Water, non-chlorinated1.5 L
  • Cinnamon stick + optional clove / chillito taste

How to make it

  1. Step 1

    Rinse a ripe pineapple. Peel it and keep the skin and core (fruit flesh is optional).

  2. Step 2

    Dissolve piloncillo or brown sugar in the water in a clean jar or crock.

  3. Step 3

    Add peels, core, cinnamon and any spices. Weight the peels under the liquid.

  4. Step 4

    Cover with cloth. Ferment 2–3 days at 20–28 °C, tasting daily.

  5. Step 5

    When tangy and lightly fizzy, strain out solids. Bottle 1 day more for extra fizz if you like.

  6. Step 6

    Refrigerate. Drink within a few days — it keeps fermenting and can turn vinegary or boozy.

What it is

Tepache is a traditional Mexican fermented drink made from pineapple peels (and often the core), sweetened with piloncillo or brown sugar and spiced with cinnamon. Wild yeasts and bacteria on the fruit skins ferment the sugary liquid in two to three days into a cloudy, tangy, lightly effervescent soda — a scrap ferment that turns kitchen waste into a drink.

The science

Pineapple surfaces carry wild yeasts and lactic-acid bacteria that rapidly colonise a sugar-rich brine. Yeasts generate CO₂ and a little ethanol; LAB produce organic acids that drop the pH and give tepache its sour edge (Escalante et al., 2008 — related Mexican fermented beverages show similar yeast–LAB successions). Short ferments stay refreshing and low in alcohol; longer ones grow sharper and more alcoholic, eventually heading toward vinegar if acetic bacteria take over.

Ripe, unsprayed (or well-washed) fruit gives the culture the best start.

Safety

Keep peels submerged, ferment in glass or food-grade vessels, and taste daily. Stop when it smells fruity-sour and yeasty, not rotten. Discard if fuzzy mould appears on the surface. Bottle carefully — active tepache builds pressure. Refrigerate to slow further fermentation; it is not a long-keeping shelf drink.

Signs it worked / troubleshooting

  • ✅ Good: cloudy liquid, gentle fizz by day 2–3, pineapple-tang aroma.
  • ⚠️ Too sharp or alcoholic = fermented too long or too warm → shorten the time, chill sooner.
  • 🚫 Mould or putrid smell = contamination → discard.

How to store

Strain and refrigerate. Best within 2–4 days. For a milder drink, chill as soon as it turns pleasantly tart.

References

  • Escalante A, Giles-Gómez M, Hernández G, et al. (2008). Analysis of bacterial diversity in Mexican fermented beverages (pulque and related drinks) by culture-dependent and -independent methods. — see also broader reviews of traditional Mexican ferments.
  • Romero-Luna HE, Hernández-Sánchez H, Dávila-Ortiz G (2017). Traditional fermented beverages from Mexico as a potential probiotic source. Annals of Microbiology 67:577–586. doi:10.1007/s13213-017-1290-2
  • Marco ML, Sanders ME, Gänzle M, et al. (2021). The International Scientific Association for Probiotics and Prebiotics (ISAPP) consensus statement on fermented foods. Nature Reviews Gastroenterology & Hepatology 18(3):196–208. doi:10.1038/s41575-020-00390-5

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