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From the Garden to the Jar™

Understanding The Importance of Acidity in Tomato Canning

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Module 2 – Understanding Acidity

module 2 all things tomato canning class

Tomatoes are one of the few foods in home canning that can be safely preserved using either a water bath canner or a pressure canner. Understanding why both methods work is one of the most important concepts you’ll learn throughout this course.

In this module, we’ll explore how tomato varieties, growing conditions, and natural acidity influence home food preservation. You’ll also learn the science behind water bath and pressure canning, why processing times differ between the two methods, and how elevation affects safe processing. To reinforce these concepts, you’ll find companion resources including an interactive guide to tomato acidity, a culinary math worksheet with tomato conversions, and a handy reference chart for converting fresh tomatoes to commercially canned products.

By the end of this lesson, you’ll have a stronger understanding of the scientific principles that make tomato canning both safe and successful, giving you the confidence to choose the method that best fits your kitchen and your preserving goals.

Companion Resources

Tomato Varieties and Factors Affecting Acidity (Interactive PDF)

Learn how tomato variety, ripeness, and growing conditions influence acidity and why those factors matter when preserving tomatoes.

Download Interactive PDF

Culinary Math and Tomato Conversions (Interactive PDF)

Practice converting fresh tomatoes into recipes while building confidence with the kitchen math used throughout this course.

Download Interactive PDF

Fresh to Commercial Tomato Conversion Chart (Printable Reference)

Keep this quick-reference guide nearby when substituting fresh tomatoes for commercially canned products in recipes.

Download Printable Chart

Ready For The Next Module?

Module 3 raw packing latin sofrito All Things Tomato Canning Class

Now that you’ve completed the course introduction, it’s time to dive into one of the most important concepts in tomato canning—understanding the importance of acidity.

Click below to continue to Module 3: Raw Packing Latin Sofrito and discover how to make this recipe from start to finish, including a bonus lesson and so much more…

➡ Continue to Module 3

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