Canning Roasted Tomatoes

Overhead view of rows of halved roasted tomatoes on baking tin
Christopher Villano / Getty Images
Prep: 20 mins
Cook: 35 mins
Total: 55 mins
Servings: 4 servings
Nutritional Guidelines (per serving)
42 Calories
0g Fat
9g Carbs
2g Protein
See Full Nutritional Guidelines Hide Full Nutritional Guidelines
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Nutrition Facts
Servings: 4
Amount per serving
Calories 42
% Daily Value*
Total Fat 0g 1%
Saturated Fat 0g 0%
Cholesterol 0mg 0%
Sodium 11mg 0%
Total Carbohydrate 9g 3%
Dietary Fiber 3g 10%
Protein 2g
Calcium 24mg 2%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)

Canning tomatoes is a great way to preserve this summer fruit to enjoy year-round. Roasting tomatoes before canning intensifies their flavor and prevents the pulp and liquid from separating, as often happens with raw-pack home-canned tomatoes. It's an extra step in the canning process of this delicious garden produce, but the results are worth it.

This recipe is for one pint of home-canned roasted tomatoes, but you can make as many pint jars as you wish simply by increasing the ingredient proportions. A really good tomato to use is the Roma because it has thicker, meatier walls and less water, which means thicker sauce in less cooking time. If you are canning in a water bath, make sure to include the acid, as is not for flavoring; you need the additional acid to safely can the tomatoes without a pressure canner. Directions for canning under pressure also are given.

Ingredients

  • 2 pounds tomatoes (washed, stemmed, and dried)
  • 1 tablespoon lemon juice (or vinegar or 1/4 teaspoon citric acid)

Steps to Make It

Note: While there are multiple steps to this technique, this process is broken down into workable categories to help you better plan for preparation and canning.

Roast the Tomatoes

  1. Gather the ingredients.

  2. Preheat the broiler. Cut washed, stemmed, and dried tomatoes in half vertically (from the stem end to the blossom end).

  3. Arrange the tomato halves cut-side down in a single layer on a rimmed baking sheet.

  4. Place under the broiler and broil until the tomatoes are wrinkled and starting to show black spots but are not burnt, 3 to 5 minutes.

  5. Alternatively, oven roast the tomatoes at 450 F for about 30 minutes.

  6. Remove from the broiler (or oven) and, when the tomatoes are cool enough to handle, rub off the skins. Don't worry about getting every last bit of skin off.

  7. Squish out most of the seed gel, but again, don't worry about getting every last seed out. Chop the tomatoes if desired.

Prepare the Canning Jars

  1. While the tomatoes are roasting, prepare the jars and water bath by placing the jar in boiling water for 10 minutes.

  2. Sterilize the lid and band in a small pot of almost-boiling water for 5 minutes, turn off the heat, and let them sit in the water until ready to fill the jar.

  3. Fill a canner half-full with water and start heating it with the lid on.

  4. Pack the tomatoes into a clean, sterilized, 1-pint canning jar. Add the lemon juice or vinegar, sprinkling it in as you pack in the tomatoes.

  5. Press down on the tomatoes with the back of a spoon to release any air bubbles. Leave 1/2-inch headspace between the tomatoes and the rim of the jar.

  6. Using tongs or a magnetic wand lifter, remove the lid from the hot water and place on top of the jar.

  7. Again using tongs, remove the band and screw on snugly but not all the way.

Process the Tomatoes

  1. Place the jar in the boiling water bath making sure they are covered by 1 to 2 inches of water. Keep them in the boiling water for 85 minutes (adjust the canning time if you live at a high altitude).

  2. Using tongs, or a canning jar grabber, carefully remove the jar from the water bath and set on a clean towel on a flat counter. Listen for the popping sound, which indicates a good vacuum seal. You can remove the ring if you like, or loosen it quite a bit so it doesn't rust in place due to trapped moisture.

  3. When the jar has cooled completely, check that it is sealed by pressing the center of the lid. If it pops up and down and/or makes a popping sound, it is not sealed. To safely consume the tomatoes, place the jar in the refrigerator immediately and use within one week.

  4. When completely cool, store in a dry, dark, cool place for up to one year. If you see the tomatoes floating above a layer of liquid, that's normal. Tomatoes have a lot of water in them and will separate, which is more visible in a glass jar than in a commercial can.

Tip

You can roast the tomatoes the day before canning if you prefer. Store in an airtight container in the refrigerator.

Glass Bakeware Warning

Do not use glass bakeware when broiling or when a recipe calls to add liquid to a hot pan, as glass may explode. Even if it states oven safe or heat resistant, tempered glass products can, and do, break occasionally.

Recipe Variations

Home-canned roasted tomatoes are delicious as they are, but they can be amped up if desired.

  • Before roasting, sprinkle the tomatoes with 1 to 2 teaspoons of dried, crushed herbs like rosemary, thyme, and basil.
  • Add 1 tablespoon sugar to each pint jar to offset an aggressive acid taste. 
  • Add 1/2 teaspoon salt to each pint jar if desired.

How to Pressure Can Roasted Tomatoes

Tomatoes are acidic enough so they can be preserved in either a boiling-water bath or pressure canner, but low-acid fruits, vegetables, and meats need pressure canning. Pressure can roasted tomatoes this way:

  1. Start with a clean pressure canner. Place the rack plate on the bottom and fill it with 4 inches of hot water or follow the directions that came with your unit. Place it on the stove over low heat with the lid off while you roast the tomatoes.
  2. Place the filled jar on the canner rack. If the water is below 3 inches, add more hot tap water to come to that level. Place the pressure canner lid on and twist it into place but leave the weight off or valve open.
  3. Turn the heat to high and let the steam escape through the vent for 10 minutes. Then put the weight on and/or close the valve and let the pressure build to 11 pounds. 
  4. Once the gauge reaches 11 pounds, process for 25 minutes, adjusting the heat as necessary to keep the pressure stable.
  5. When the time is up, remove from the heat and let it cool down until the pressure gauge reaches zero before attempting to open the canner.
  6. Using tongs, remove the jar from the canner and proceed with the directions for water bath canning.