Sauce · Fermented, then refrigerated or bottled
Fermented Red Jalapeño Sriracha
Red jalapeños and a whole head of garlic, fermented as a 2.5% salt mash for a week, then blended with vinegar and a little sugar and simmered thick. Homemade sriracha that tastes like chile first and garlic second.
Not a tested canning process
A salt-mash ferment finished with vinegar lands well below pH 4.6, which is why fermented chile sauces keep for months in the refrigerator. It is not a USDA/NCHFP tested canning process, so we don't tell you to shelf-store it. Simmer after blending to stop fermentation, check pH with a calibrated meter, then bottle and refrigerate.
How pH decides whether a jar is safe → · Brine percentage and what actually goes wrong →
If you started today, in Zone 6, in pots
2 plants. 2 jars. Sauce on Jul 26.
Worked from Zone 6's average last frost (Apr 21) and each cultivar's days to maturity. Your zone and your space change every date below — the builder does that for you.
- Feb 3Order seeds and starting supplies
- Feb 24Sow indoors under lights
- Apr 21Average last frost (Zone 6)
- Jun 12First Hardneck Garlic harvest
- Jul 12First Jalapeño harvest
- Jul 26Sauce day — Fermented Sriracha
- Aug 5Ferment finishes — check pH, then bottle
Save it
The whole season, one pin
| Yield | About 2 cups. Fills two half-pint jars or three 5 oz woozy bottles — 2 half-pint jars |
|---|---|
| Active time | 40 minutes |
| Total time | 25 minutes to mash, 5–7 days fermenting, 15 minutes to finish |
| Heat | 2,500–8,000 SHU from the jalapeño, slightly lower once blended |
| Target finished pH | 3.3–3.8 — confirm under 4.0 with a calibrated meter |
| Preservation | Fermented, then refrigerated or bottled |
| Fruit this batch eats | 1.5 lb Jalapeño0.12 lb Hardneck Garlic |
What you have to grow
Commercial sriracha is red jalapeño, garlic, sugar, salt and vinegar, ground to a paste and aged. That’s five ingredients, and the two that matter most come out of your own beds. Grown, fermented and blended at home, it’s brighter and more garlicky than the rooster bottle, with a lactic tang underneath that you won’t get from a fresh-blended version.
It’s also the best argument for leaving jalapeños on the plant. Picked green, a jalapeño is grassy and sharp. Left three or four extra weeks until it’s fully red, it turns sweet and fruity, and that’s the flavour sriracha is built on.
What you need
| Ingredient | Amount |
|---|---|
| Red jalapeños, stemmed | 1.5 lb (680 g) |
| Garlic, peeled | 1 head (about 55 g) |
| Canning & pickling salt | 2.5% of pepper + garlic weight, 18 g here |
| Light brown sugar, to start the ferment | 1 tbsp |
| Distilled white vinegar (5%) | 1/2 cup |
| Light brown sugar, to finish | 2–3 tbsp |
Method
- Gloves on.
- Weigh the stemmed jalapeños and peeled garlic together. Multiply by 0.025 to get the salt. 735 g × 0.025 = 18 g.
- Pulse to a coarse mash in a blender or food processor with the salt and 1 tbsp sugar. Leave the seeds in.
- Pack it into a jar and press hard with a weight until liquid rises over the solids. Leave at least 2 inches of headroom, because the mash swells. Airlock lid on.
- Ferment 5–7 days at 65–75 °F, out of direct light. It’s active when bubbles thread through the mash and it smells sour rather than raw.
- Blend smooth with the vinegar and 2–3 tbsp sugar, a full minute on high.
- Strain or don’t. Pushing it through a fine sieve gives you the smooth bottle texture. Unstrained is more rustic and has more body.
- Simmer 5 minutes, stirring, to stop fermentation and tighten the sauce. Cool.
- Calibrate the meter, then read the pH. Aim for 3.3–3.8 and make sure it’s under 4.0. If it’s high, add vinegar a tablespoon at a time and read again.
- Bottle, label, refrigerate.
The garlic is the second chile
A whole head sounds like too much until you taste it. Fermentation takes the raw, hot edge off garlic and leaves something sweeter and rounder, and in sriracha garlic is a co-lead, not a seasoning. If you grew hardneck garlic, use the cloves that were too small to replant. The fermentation won’t care what size they are.
Mash salt is a percentage, not a pinch
2.5% sits in the middle of the reliable working band for hot sauce. Below about 2% you lose the margin that keeps spoilage organisms from outcompeting the lactobacillus. Above 5% the ferment stalls. The fermentation salt and safety guide explains the reasoning. A $15 kitchen scale makes this a non-issue.
Storage
Refrigerated, it keeps for months, and it gets a little more rounded over the first few weeks. The colour slowly darkens from fire-engine red to brick, which is oxidation, not spoilage. Shake before use.
The kit for this sauce
Each item is selected for a job in this recipe. Amazon listings, sellers, and prices can change; check the current details before you buy.
Jalapeño Pepper Seed
The one you smoke into chipotle. Left on the plant to red and corked, then cold-smoked, a jalapeño stops being a taco garnish and becomes the backbone of an adobo.
Siberian Hardneck Seed Garlic, 1 lb
Planted in October, pulled in July. Hardneck garlic has bigger, easier-peeling cloves and gives you scapes in June — a free second crop that is itself excellent in green sauce.
Nitrile Exam Gloves, 200 pcs, food-safeMust have
Capsaicin is oil-soluble and does not wash off with soap. Seeding a pound of habaneros bare-handed means eight hours of burning hands and one unforgettable mistake involving your own eye.
Digital Kitchen Scale, 11 lb, g/ozMust have
Fermentation brine is a percentage of weight, not a number of spoons. Without a gram scale you are not following a fermentation recipe — you are guessing at the one number that determines whether it is safe.
Canning & Pickling Salt, 4 lb ×4Must have
Table salt carries iodine and anti-caking agents. Iodine suppresses the lactobacillus you are trying to cultivate and the anti-caking agent turns your brine cloudy grey.
Complete Mason Jar Fermentation KitMust have
Fermentation is anaerobic. An airlock lets CO₂ out without letting oxygen in, which is the entire difference between a clean lacto-ferment and a jar of kahm yeast and mould.
Glass Fermentation Weights, 4-PackMust have
Anything floating above the brine will mould. A glass weight holds the chile mash under the surface for three weeks without you touching it, which is the whole job.
AI311 PH60 Waterproof Pocket pH TesterMust have
The 4.6 line is not a guideline, it is the number below which Clostridium botulinum cannot grow. Strips get you to half a pH point. This gets you to ±0.1, and for anything you intend to keep, that difference is the whole ballgame.
AI1113 pH Calibration Buffer Kit (4.00 / 7.00)
A pH meter is only as honest as its last calibration. Two-point calibration at 4.00 and 7.00 brackets the entire range a sauce ever lives in.
5200 Professional-Grade Blender, 64 oz
The difference between a hot sauce that is smooth and one that is smooth-ish is blade tip speed. A Vitamix emulsifies chile skin into the sauce so completely you do not need to strain it.
Mesh Strainers, Stainless, 3-Count
The last pass before bottling. A fine mesh catches the skin fragments and seed shards that make a hot sauce gritty and clog a woozy bottle's dripper insert.
Woozy Hot Sauce Bottles, 5 oz, 24-PackMust have
A hot sauce in a mason jar is a condiment you spoon. In a woozy bottle with a dripper insert it is a hot sauce — and dripper control is the difference between seasoning food and ruining it.
Canning Jar Labels, 360 pcs, removable
Date every jar. In March, three jars of red sauce are indistinguishable, and 'it's probably the one from August' is not a food-safety practice.
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Questions people actually ask
Why a mash and not a brine?
A brine ferment dilutes the sauce with water you then have to blend back in, which gives you something thin and pourable, like Louisiana sauce. Sriracha should be thick. Mashing the peppers with dry salt lets their own juice become the brine, so the finished sauce is all chile and garlic.
Why does it need sugar?
Two reasons. A spoonful at the start gives the lactobacillus an easy meal and gets the ferment going in a day rather than three. More sugar at the end balances the vinegar, and that rounded sweet-hot finish is what makes sriracha taste like sriracha.
Do I have to cook it?
Cooking stops fermentation. An unsimmered fermented sauce keeps producing CO2 in the bottle and can push a cap off or spray when you open it. Five minutes at a simmer thickens it slightly too. Skip it only if you're happy to burp the bottles.
I have white film on top of the mash.
Flat white film is usually kahm yeast. It's harmless but tastes stale, so skim it. Fuzzy, raised, coloured spots (blue, green, black or pink) are mould, and that batch goes in the bin. Keeping every piece under the weight and the airlock on is what prevents both. See the fermentation safety guide.
Can I use other peppers?
Any thick-ish red chile works. Fresno is the commercial choice. Red serrano runs hotter and red Marconi milder and sweeter. Keep the 2.5% salt figure based on whatever weight you use.
Last reviewed 2026-10-17 by the SeedsToSauce Test Kitchen. Spotted something wrong?Tell us — corrections get published.