Fermented Hot Sauce

Weigh all chiles and garlic together — this is your total vegetable mass. Calculate 3% of this weight in non-iodized salt (e.g., 350 g total vegetables = 10.5 g salt). This 3% salt ratio is the key control: too little salt invites soft-rot bacteria to outcompete the lactobacillus; too much suppresses all microbial activity. Remove the stems from the chiles but keep the seeds — they carry heat, flavor, and beneficial surface microorganisms. There is no need to blanch or cook the chiles. Wear gloves when handling more than a handful of cayennes, and avoid touching your face.

Dissolve the weighed salt completely in the filtered water to make the brine — stir for a full minute to ensure every grain is dissolved. Pack the chiles and garlic tightly into a clean wide-mouth jar, pushing them firmly to leave as little air space as possible. Pour the brine over the chiles until they are fully submerged, leaving 3 to 4 cm of headspace. Weigh the chiles down below the brine surface using a fermentation weight, a small zip-lock bag filled with brine, or a folded cabbage leaf pressed flat. Any chile exposed to air above the brine surface will mold. Seal with a loose lid or an airlock.

Ferment at room temperature, 18 to 24°C, for 10 to 14 days. In the first 2 to 3 days the brine will turn cloudy and pale as lacto-bacteria multiply — this cloudiness is normal and desirable. You may see small bubbles clinging to the chiles or rising through the brine. Taste the brine daily from day 5 onward: it should progressively shift from salty toward pleasantly sour and tangy. The chiles will fade from vivid red to a duller brick-red as pigments change. Check daily for surface kahm yeast (a flat, white film on the brine surface) — this is harmless; skim it off with a spoon. Any fuzzy, raised, or colored mold means discard the whole batch.

Drain the fermented chiles and garlic into a bowl, reserving ALL of the brine — it is the lactic acid heart of the sauce. Transfer the chiles and garlic to a blender and add enough of the reserved brine to blend smoothly, starting with half and adding more until you reach your preferred consistency. Blend on high for 2 full minutes until completely smooth. Taste and adjust: add more brine for more tang and salt, or a splash of fresh water to mellow it. For a classic Louisiana-style smooth sauce, strain through a fine sieve, pressing the solids; for a chunkier sauce, leave unstrained. Bottle in clean jars or squeeze bottles. The sauce keeps refrigerated for 6 months and continues to develop complexity slowly.