StretchLearn Course

Ferment Anything Safely — From Sauerkraut to Kombucha

Learn the science behind salt brines, live cultures, and vinegar pickles so you can preserve food with confidence.

Beginner9 hrSelf PacedRegistered

Course Overview

What this course is designed to develop

Lacto-fermentation is one of humanity's oldest preservation methods, relying on naturally occurring Lactobacillus bacteria to acidify food safely without heat. This course walks you from foundational microbiology through practical projects — sauerkraut, kimchi, fermented hot sauce, kombucha SCOBY care, and water kefir — before covering vinegar pickling as a complementary technique. Every module emphasises measurable safety checkpoints: target pH ranges, brine salinity percentages, and visual fermentation indicators so you ferment with confidence, not guesswork.

Learning Outcomes

What the learner should be able to understand, build, or execute.

Explain the role of Lactobacillus bacteria in acidifying vegetables and calculate correct salt-to-water brine ratios by weight

Prepare sauerkraut, kimchi, and a fermented hot sauce using the direct-salt and brine-submersion methods

Set up and maintain a kombucha SCOBY culture and a water kefir grain system through multiple brew cycles

Distinguish lacto-fermentation from vinegar pickling and select the correct method for a given ingredient and shelf-life goal

Verify fermentation safety using pH strips or a digital pH meter and identify signs of spoilage versus normal fermentation activity

Sterilise jars and equipment, label batches correctly, and store finished ferments for maximum shelf life

Curriculum Preview

Inside the curriculum: a structured path from fundamentals to execution.

Preview the course structure, see how the modules build on one another, and understand the path this program is designed to take you through.

Module 1

Module 1: The Science of Lacto-Fermentation

Understand the microbiology behind salt-driven fermentation, how Lactobacillus bacteria acidify food, and why this preservation method is safe when done correctly.

3 lessons

How Lacto-Fermentation WorksContent · 45 min

Preview Enabled

Understanding pH, Acidity, and Safety ThresholdsContent · 45 min

LMS Access

Equipment Sterilisation and Vessel SelectionContent · 45 min

LMS Access

Module 2

Module 2: Sauerkraut, Kimchi, and Fermented Vegetables

Apply dry-salt and brine-submersion methods to make classic sauerkraut, traditional kimchi, and a range of quick-fermented vegetables.

3 lessons

Classic Sauerkraut: Dry-Salt MethodContent · 45 min

LMS Access

Kimchi: Baechu (Napa Cabbage) KimchiContent · 45 min

LMS Access

Quick-Fermented Vegetables: Carrots, Cucumbers, and Hot SauceContent · 45 min

LMS Access

Module 3

Module 3: Kombucha and Water Kefir

Set up and maintain live SCOBY and grain cultures through multiple brew cycles, understanding the microbiology and troubleshooting common problems.

3 lessons

Kombucha: First Brew and SCOBY CareContent · 45 min

LMS Access

Kombucha Second Fermentation and CarbonationContent · 45 min

LMS Access

Water Kefir: Setting Up and Maintaining Grain CulturesContent · 45 min

LMS Access

Module 4

Module 4: Vinegar Pickling and Long-Term Storage

Understand how vinegar pickling differs from lacto-fermentation, apply quick and shelf-stable pickling methods, and develop a storage and labelling system for all your ferments.

3 lessons

Vinegar Pickling: Science and Quick-Pickle TechniqueContent · 45 min

LMS Access

Shelf-Stable Pickling with Water Bath ProcessingContent · 45 min

LMS Access

Labelling, Cellar Storage, and Building a Fermentation PracticeContent · 45 min

LMS Access

Built for Application

A complete learning path, not a one-off inspiration hit.

This program is designed around progression: focused lessons, structured modules, applied resources, assessments, and a course rhythm that turns information into usable capability.

lacto-fermentationpicklingsauerkrautkimchikombuchawater kefirbrine ratiosfood safety