Note: Cherry tomatoes can be canned peeled, or unpeeled. See notes above recipe card for details.
- Wash tomatoes. If you plan to can tomatoes with skin on, skip step two.
- Heat a large pot (about 4 quart) half full of water to a boil, and blanch tomatoes for 60-90 seconds, until skins begin to loosen. Remove from hot water, and cool. Pull skins off.
- Pack prepared tomatoes into pint or quart jars, leaving about an inch of headspace.
- Top pint jars with 1 tablespoon of lemon juice, or 1/4 teaspoon citric acid, and 1/2 teaspoon of salt. Double amounts for quart jars.
- Fill with water, leaving about 1/2 inch of headspace. Use a butterknife to release any trapped air bubbles.
- Wipe rims with a damp cloth to remove any debris, then screw down lids and bands.
- Prepare water bath canner with cool water
- Add jars of tomatoes to canner, adding enough water to cover jars to a depth of at least one inch.
- Place lid on canner, and heat over medium-high heat to a rolling boil.
- Process pint jars for 40 minutes, and quart jars for 45 minutes.
- Remove from heat, and let cool.
- Jars can be removed from canner after they have stopped boiling inside. Be careful to protect the jars from drafts, and yourself possible breaking if a draft hits them. This is pretty rare, as long as you keep them covered with a towel.
- After 24 hours, check for seals, wash jars if needed, and store in a cool place, out of direct light.