The Most Helpful Fermentation Guide on the Internet

Lacto-fermentationLacto-FermentationSalt-driven fermentation where lactic acid bacteria preserve produce and build acidity. is one of the most powerful tools in a chef's larder, offering a sustainable way to preserve seasonal produce while introducing complex, bright acidity to the menu. In this masterclass, Mike Greenfield breaks down the fundamental science and practical mechanics of vegetable fermentation, demystifying the process through a reliable mathematical framework. Rather than relying on guesswork, chefs learn how to apply precise salt ratios to guarantee safe, consistent, and deeply flavourful results every time.

Mastering the Salt Equation

The cornerstone of successful lacto-fermentationLacto-FermentationSalt-driven fermentation where lactic acid bacteria preserve produce and build acidity. is understanding the salt equation. Salt does not merely season; it selectively encourages beneficial lactic acid bacteria while inhibiting spoilage-causing pathogens. Greenfield explains how to calculate the correct salt-to-water or salt-to-vegetable ratio. Depending on the moisture content of the ingredient, chefs must choose between dry salting (perfect for shredded or watery vegetables that release their own liquid) and wet brining (ideal for whole or dense vegetables like garlic scapes and radish pods). Calculating this percentage based on the total weight of the water and produce combined ensures a precise and safe fermenting environment, regardless of the vessel size.

Essential Kit and Environmental Control

While fermentation is an ancient art, modern professional kitchens benefit from utilising the right gear to minimise waste and spoilage. Greenfield guides viewers through selecting appropriate vessels, fermentation weights, and specialised lids. The critical factor in lacto-fermentationLacto-FermentationSalt-driven fermentation where lactic acid bacteria preserve produce and build acidity. is keeping the environment completely anaerobic; vegetables must remain submerged beneath the brine to prevent mould formation. Using weights to keep the produce compressed and implementing venting lids or airlocks allows carbon dioxide to escape without letting oxygen in, maintaining a pristine environment for the bacteria to thrive.

Managing the Fermentation Timeline

Once the vegetables are prepped and submerged, the transition from raw ingredient to funky, sour pickle is a matter of time and temperature. Greenfield demonstrates this process using unique ingredients like garlic scapes and radish pods, highlighting how different structures respond to the brine. The fermentation timeline is highly subjective and temperature-dependent; chefs must rely on regular tasting sessions to determine the perfect balance between acidity, crunch, and funk. Once the desired flavour profile is achieved, the ferment can be cold-stored to slow down the process and maintain consistency for service.