Tepache is Mexico’s fermented pineapple drink, and it runs on the part of the fruit you throw away. The rind and core carry the wild yeast, piloncillo feeds it, and 48 to 72 hours later you have a tart, lightly funky base for about 25 cents a serve. This version chars the fruit first, filters to full transparency, and force-carbonates for service consistency. With mezcal it is a 20-second build.
The drink
Fermentation is the one prep technique most cocktail bars never touch, and tepache is the correct entry point: no starter culture, no airlock, no lab. The yeast is already on the pineapple skin. Your job is to feed it, taste it daily, and stop it when it is right.
Two changes take it from market stall to menu. First, the fruit is charred hard before it goes in, which adds a roasted caramel edge that reads beautifully against mezcal smoke. Second, the wild carbonation is discarded and replaced with forced CO2. Wild fizz is different every batch. Forced gas at a measured 6 g/L is the same drink every night, which is the whole point of putting a ferment on a menu.
Finished-drink targets
- ABV: ~12% in the glass
- Serve: highball glass, clear ice spear, 165 ml liquid
- Build: 45 ml mezcal, 120 ml carbonated tepache
- Carbonation: 6 g CO2 per liter, forced, not wild
- Clarity: transparent amber. Coffee filter is not optional.
- Tepache shelf life: 2 weeks at 0–4°C
- Cost: ~$2.10 a serve, ~13% pour cost at $16
Prep: grilled pineapple tepache
One ripe pineapple, about 1.6 kg whole, runs the batch. Ripe matters: the yeast population and the sugar both peak with ripeness. Rinse the fruit briefly under cold water. Do not scrub it and do not sanitize it, the wild yeast you need lives on the rind. The vessel, on the other hand, gets cleaned properly.
Spec, per whole pineapple (~1.6 kg)
- Rind and core of the whole pineapple, rinsed, chopped coarse
- 400 g pineapple flesh, cut in 2 cm slabs
- 2,000 g filtered water
- 240 g piloncillo, grated (dark brown sugar works)
- 4 g canela (one stick)
- 2 cloves
1. Peel and core the pineapple. Reserve all rind and core.
Cut 400 g of the flesh into slabs; the rest goes to the
kitchen or the dehydrator for garnish.
2. Char the flesh slabs on a dry plancha or cast iron pan,
high heat, 3 to 4 minutes per side, until deeply browned.
No oil. Do not char the rind; that is where the yeast lives.
3. Dissolve the piloncillo in the water. Combine everything
in a clean nonreactive container, at least 4 L. Liquid should
cover the solids; weigh them down with a small plate if not.
4. Cover with cloth, not a lid. Hold at 22–24°C.
5. Stir twice a day. Taste from 48 hours. It is done when it
is tart, still lightly sweet, and gently funky: usually 48 to
72 hours. Warmer room, faster ferment.
6. Strain through a chinois, then once through a coffee
filter. Cold-crash to 0–4°C in a vented container.
7. Yield: ~2.2 L. Label with the ferment start date.
Holds 2 weeks refrigerated; it keeps moving slowly, so
taste it every service week.
Doneness is a taste call, not a clock. Stop it early and it is pineapple soda; push it past three days at room temperature and it goes vinegary and thin. At 48 to 72 hours the ABV lands around 1 to 2%, which is why the finished ferment is treated as an alcoholic ingredient in the math below. One safety note: a healthy tepache smells like pineapple, caramel and fresh bread. Anything moldy on the surface or solvent-like on the nose, discard the batch and start again. A batch costs five dollars; a bad pour costs a guest.
Carbonation
Filter first, then gas. Suspended fruit particle is a nucleation site: a hazy tepache foams on the pour, dumps its gas, and looks dull in the glass. This is the same rule as every carbonated serve we run, and it is why the coffee filter is in the spec.
Method
1. Chill the filtered tepache to 0–2°C.
2. Keg: gas at 30–35 psi, rock 2 minutes, rest 20
minutes, store at 12–15 psi. Bottles: carbonator cap,
three passes, venting headspace between passes.
3. Verify by weight on bottles: tare before gassing, vent,
weigh again, target +6 g per liter.
4. Keep it cold and sealed. Under CO2 the ferment holds its
profile noticeably longer than in an open container.
Service
Build in the glass: 45 ml mezcal over a clear ice spear, top with 120 ml cold carbonated tepache, one gentle lift with a barspoon. Garnish with a dried pineapple crisp made from the leftover flesh, or nothing. An espadín at 40 to 45% is right here; the smoke should sit behind the fruit, not on top of it. Blanco tequila works if the list has no mezcal slot, and the drink loses nothing structurally.
The zero-proof listing is already made: tepache alone over ice, 150 ml, is a legitimate NA highball at about 35 cents a serve.
The operator math
Per serve, at retail-ish prices:
- Mezcal: 45 ml from a $30 bottle, ~$1.80
- Tepache: 120 ml, ~$0.27 (pineapple $3.50, piloncillo and spice ~$1.50, yield 2.2 L)
- Total: ~$2.10. At $16 on the menu, ~13% pour cost.
One pineapple gives 18 serves. Active prep time is about 30 minutes; the other 48 to 72 hours are the ferment working while nobody is paid to watch it. And the base ingredient is trim: if the kitchen runs pineapple at all, the rind and core are already in your building, costed to someone else’s plate.
Why this technique earns its place
Fermentation has a reputation as the deep end: lab bars, chambers, brett cultures. Tepache is the version that fits a normal prep schedule. It needs a container, a cloth, a warm corner and a tongue. What it teaches a team is the skill that matters in all fermentation work, which is tasting toward a target and knowing when to stop. Once the bar can run this, kombucha, ginger beer and fruit sodas are the same discipline with different inputs.
Builds like this, written down with yields, shelf life and costs, are what a menu refresh engagement produces. If fermentation has stayed in the too-hard pile at your bar, fifteen minutes will tell you where to start.