Vinegar production through acetification — the conversion of alcohol to acetic acid by Acetobacter bacteria — is one of the oldest fermentation traditions in the world. Every wine-producing culture independently discovered that exposed wine becomes vinegar. The mother of vinegar (a cellulose mat produced by Acetobacter) has been passed between producers as a living starter culture for centuries. Noma documented the precise conditions for controlled vinegar production from any alcoholic base.
The conversion of an alcoholic liquid (wine, beer, cider, kombucha, fermented fruit juice) into acetic acid through the action of Acetobacter bacteria in the presence of oxygen. Unlike lacto-fermentation, acetification requires oxygen — it is an aerobic process.
House-made vinegar carries the flavour of its alcoholic origin — wine vinegar tastes of wine, cider vinegar of apple, sake vinegar of rice. Commercial vinegar is standardised; house-made vinegar is specific. The base material determines the flavour, making vinegar production a direct extension of the culinary philosophy of sourcing and identity.
- Alcohol percentage of the starting liquid must be between 5–12% — too low and there is insufficient substrate for meaningful acetic acid production; too high and the Acetobacter cannot tolerate the alcohol concentration [VERIFY range] - Oxygen access is essential — the vinegar vessel must be covered with cloth (not a lid) to allow air circulation while preventing contamination - Temperature: 25–30°C optimal for Acetobacter activity [VERIFY] - The mother that forms on the surface is the active colony — it should be kept intact and added to new batches as a starter. A thick, healthy mother indicates vigorous fermentation - Finished vinegar should be strained and pasteurised to halt fermentation and prevent further transformation. Unpasteurised living vinegar continues to develop [VERIFY pasteurisation temperature] Sensory tests: - Active fermentation: sharp, clean vinegar smell developing over days. Cloudy liquid with a forming mat on the surface - Finished vinegar: sharp, clean acetic acid character, no alcohol smell remaining, clear after straining
MAANGCHI KOREAN — Second Batch KR-26 through KR-40