Canning Vault field guide
Water-Bath Canning Basics
Build a safe foundation: equipment, boiling-water processing, and tested recipes. Start with the decisions that make every later step easier: match the food to the correct canning method, use a research-tested recipe, and prepare the canner before filling the first jar.
Chapter 01
Match the food to the method
Boiling-water canning is designed for acid foods and foods that have been acidified according to a tested formula. Fruits, properly acidified tomatoes, pickles, relishes, jams, and jellies are common examples.
Low-acid vegetables, meats, poultry, and seafood require a tested pressure-canning process. Boiling water never reaches pressure-canning temperatures, so simply extending a boiling-water process is not a safe substitute for the recommended pressure process.
Chapter 02
Treat the tested recipe as one complete process
A safe recipe is more than an ingredient list. Jar size, pack style, piece size, headspace, temperature at filling, processing method, processing time, and altitude adjustment all affect how heat moves through the jar.
Keep those controls together. Changing several small details can create a product that no longer matches the process that was tested.
- Use the jar size and hot-pack or raw-pack method named in the recipe.
- Measure headspace rather than estimating it.
- Use the recipe's complete altitude schedule before starting the timer.
Chapter 03
Prepare the canner before the jars are filled
Use a canner with a fitted lid and a rack that keeps jars off the bottom. Keep at least one inch of water over the jar tops during processing, or two inches when the process is longer than 30 minutes.
Preheat water for the pack style in the tested directions, load jars upright with a jar lifter, and begin timing only when the water returns to a full boil. Keep the boil steady for the entire scheduled process.
Chapter 04
Build a calm batch rhythm
Read the full recipe first, gather equipment, check your elevation, prepare jars and lids, and organize ingredients before heating the food. This reduces rushed decisions after the process has begun.
When processing ends, turn off the heat, remove the canner lid, and wait five minutes before lifting the jars unless the tested directions say otherwise. Keep jars upright and let them cool undisturbed for 12 to 24 hours before testing seals; a sealed lid does not correct an unsafe or incomplete process.