Canning tomatoes

Traditionally, canning tomatoes has usually been done by using the hot water bath canner method. Recently, however, more people are finding that canning tomatoes in a pressure canner will result in higher quality and give you a more nutritious product.

Pressure canning is also required for many canned tomato combination products because the pH value is above 4.6 which is a low acidic food. Tomatoes themselves fall close to the low acid level, just slightly above 4.6 and when mixed with meat for sauces or with vegetables like peppers or zucchini, which are a low acidic food it raises the pH value above 4.6 and must be processed by pressure canning to insure food safety. Foods that have a pH value of 4.6, or lower, may be processed in a boiling water bath canner.

When canning tomatoes by themselves, it is recommended that acid should be added to lower the pH level. This can be done by adding 1 tablespoon of lemon juice or 1/4 teaspoon citric acid per pint of product. For quarts, add 2 tablespoons of lemon juice or 1/2 teaspoon citric acid. This may be done by adding directly to jars before filling.