Fermentation: The Mark Of Time In Gastronomy

The Scientific Name Of Transformation

The consensus statement of the ISAPP expert panel, published in 2021 in Nature Reviews Gastroenterology & Hepatology, defines fermented foods as foods made through desired microbial growth and enzymatic conversions of food components. ISAPP’s topic page summarises the same definition.

The definition has two parts: microorganisms grow, and that growth is intended. Enzymes alone are not enough; deliberate fermentation is distinguished from spoilage.

Assessing a hot sauce requires records specific to the product and its production process alongside the general definition.

Are Fermented And Probiotic The Same Thing?

The consensus distinguishes fermented foods from probiotics. Probiotics are live microorganisms that confer a health benefit when administered in adequate amounts. Applying that description to a fermented product requires appropriate strain identification, viable amounts and human evidence of benefit. In the research landscape described by the paper in 2021, randomized trials beyond yoghurt and cultured dairy were limited.

Whether live cultures remain in the finished product depends on processing after fermentation and storage conditions. The word “fermented” on a label does not establish a particular viable count or a health benefit.

What Changes In Pepper Mash?

Research on pepper mash and pickled peppers presents distinct products and processes rather than a single fermentation profile. The relative share of lactic acid bacteria, pH and volatile compounds are read alongside formulation, salt conditions and sampling times.

In Xu and colleagues’ 2025 study, the relative abundance of Lactiplantibacillus in pickled peppers was 28.00 percent on day 30 and 42.99 percent on day 45; day-45 pH was reported as 3.71 in pickled samples and 4.49 in salted samples. The formulations differed: citric and acetic acids had also been added to the pickled samples. Tang and colleagues’ 2024 study related salt level to microbial community composition, with Zygosaccharomyces prominent in the high-salt group. Liao and colleagues’ 2023 study compared salinity levels of 8, 13 and 18 percent and reported succession from Leuconostoc, Weissella and Lactococcus to Lactobacillus and Pediococcus.

Korean gochujang provides a different ecosystem. Ryu and colleagues compared samples at the start and after 12 months in their 2021 study; Bacillus became prominent after fermentation and pH was slightly lower. Watts and colleagues followed pepper mash for 18 months in 2018 and reported an inverse relationship between pH and acid content. Huang and colleagues’ 2025 study compared laboratory fermentations of two pepper varieties and called for industrial validation. Ma and colleagues’ 2022 study also examined microbial changes alongside volatile compounds in chopped peppers.

These values are the results of particular studies, with particular salt levels and durations; they are not a recipe or a safety measure.

Changing Together Versus Causing

In these studies the links between aroma and microbes are statistical associations. Xu and colleagues reported that geraniol and β-myrcene rose together with Lactiplantibacillus; Liao and colleagues reported that certain lactic acid bacteria and yeasts were associated with spicy, fruity and floral notes.

A taxon and a compound changing together in the same samples does not by itself establish a production pathway. Testing a pathway requires experiments that separate the microorganism, control conditions and measure the outcome again. The distinction between association and cause is retained when these findings enter gastronomic writing.

The scientific record shows the sample and the method; the craft record shows the process, the tool and the person. Each completes the other.

• From pepper to bottle

Records Of Time: Harissa, Jang And Pixian Douban

UNESCO inscribed Tunisia’s harissa on the Representative List of the Intangible Cultural Heritage of Humanity in 2022. The inscription describes sun-dried, seeded and ground chili with salt, garlic and coriander; it does not mention fermentation or ageing.

Korea’s jang-making tradition joined the same list in 2024. The inscription includes red chili paste, covers fermentation, ageing and storage, and notes that the knowledge passes mainly from mothers and mothers-in-law to daughters and daughters-in-law. Korea had designated the tradition national intangible heritage in 2018. The Academy of Korean Studies’ Somun saseol entry discusses gochujang alongside Jeungbo sallim gyeongje (1766) in the context of early culinary texts.

China’s Pixian douban making technique entered the national intangible heritage list in 2008; the name ‘Pixian Dou Ban’ is protected in the European Union under the 2020 EU–China agreement on geographical indications.

On Time: Slowness And Perishability

The Slow Food Manifesto was signed in Paris in 1989. It likens speed to a shackle, argues for slow and prolonged enjoyment and takes the snail as its symbol; it does not mention fermentation.

Anthropologist Heather Paxson’s 2021 article examines how fermented foods move across borders through the ideas of perishability and time, under the heading of ‘timescapes’.

In a production record, the harvest date, the order of steps and the moment the record was made carry different times. Describing fermentation means writing each of them down.

What This Article Does Not Cover

This article is not a recipe, a salt ratio, a timetable or a food-safety guide. The numbers in the studies belong to their own conditions and cannot be used as measures for home production.

Understanding fermentation is a starting point for reading craft accounts from pepper to bottle and measurements of acidity.

• From pepper to bottle: following the traces of craft
• Sourness, pH and acidity