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Preserving Summer: The Magic of Home-Canned Tomatoes

There’s something deeply satisfying about opening a jar of tomatoes in the dead of winter, the vibrant red a stark contrast to the grey outside. It instantly transports me back to late summer days, the smell of sun-ripened tomatoes filling the kitchen, sticky fingers from peeling them, and the satisfying “clink” as each jar sealed. My grandmother taught me how to can, and those shared hours, the rhythmic boiling, and the promise of summer’s bounty preserved, are some of my most cherished memories. It’s more than just preserving food; it’s preserving a piece of summer, a piece of family, and a whole lot of love.

Recipe Overview

Prep Time: 1 hour
Cook Time: 40 minutes
Total Time: 1 hour 40 minutes
Yields: 6 pints
Dietary Type: Vegan, Gluten-Free

Ingredients

6-8 lbs Tomatoes (ripe, preferably Roma or San Marzano)
6 teaspoons Canning Salt
1 1/2 teaspoons Dried Basil (optional)
1 1/2 teaspoons Citric Acid OR 12 tablespoons Bottled Lemon Juice

Equipment Needed

Large Pot
Sharp Paring Knife
Colander
Bowl
Food Processor or Tomato Masher (optional)
6 Pint-sized Canning Jars with Lids and Bands
Jar Lifter
Boiling Water Bath Canner

Instructions

First, some important points to consider. Never refrigerate tomatoes before canning, as refrigeration can diminish their flavor. Also, while tomatoes are technically a fruit, their pH typically ranges from 4.5 to 4.6. This is right on the borderline of what is safely processable in a water bath. Therefore, it’s essential to acidify them by adding lemon juice or citric acid if you plan to use a water bath canner. Add 1/4 teaspoon citric acid or 2 tablespoons bottled lemon juice per pint jar. It is best to use bottled lemon juice rather than fresh, as the pH level can be more consistent.
Another common issue to be aware of is the separation of pulp and juice in canned tomatoes. This occurs due to an enzyme activated when the tomato is exposed to air through skinning, cutting, or crushing. This enzyme breaks down the pectin, causing separation. To minimize this, heat the skinned, crushed, or cut tomatoes as soon as possible.
Bring a large pot of water to a rolling boil over high heat.
Carefully drop the tomatoes into the boiling water. Blanch them for exactly 10 seconds, then immediately remove them.
Using a sharp paring knife, make a small slit in the skin of each tomato. The skins should peel off very easily at this point.
Core the tomatoes and tear them in half. Squeeze out the seeds. Place the peeled and seeded tomatoes into another pot.
Place the skins and seeds into a colander set over a bowl. This will catch the excess tomato juice, which you can add back to the canned tomatoes or enjoy fresh. Don’t waste a drop!
Crush the tomatoes. You can use a food processor for a smoother consistency, or a tomato masher for a chunkier result. Chunks are perfectly acceptable and, in my opinion, add character.
Heat the crushed tomatoes in the pot and bring them to a gentle boil. Continue boiling for 5 minutes. The mixture may become a bit foamy on top – this is normal.
While the tomatoes are simmering, prepare your canning jars. Ensure they are clean and sterilized.
Into each of the 6 pint-sized canning jars, add 1/4 teaspoon dried basil (if using), 1 teaspoon canning salt, and 1/4 teaspoon citric acid OR 2 tablespoons bottled lemon juice.
Ladle the hot tomatoes into the prepared jars, leaving 1/2 to 3/4 inch of headspace at the top of each jar.
Wipe the rims of the jars thoroughly with a clean, damp cloth to remove any spills or residue. This ensures a proper seal.
Place the lids on the jars, and then screw on the bands fingertip tight. Do not overtighten, as this can prevent the jars from sealing properly.
Using a jar lifter, carefully place the jars into a boiling water bath canner. Add enough water to the canner to cover the jars by at least 3 inches.
Bring the water in the canner back to a rolling boil. Process the tomatoes for 40 minutes, making sure the jars remain completely covered with water throughout the entire processing time. If the water level drops at any point, carefully add more boiling water to maintain the necessary coverage. If the jars are not completely submerged at any point, you have to delete the time that the cans were not totally submerged, add water, bring back to a boil, and begin timing again, deducting any time in which the jars were not submerged.
After the processing time is complete, turn off the heat and carefully remove the jars from the canner using the jar lifter. Place them on a towel-lined surface, leaving plenty of space between each jar to allow for proper cooling.
As the tomatoes cool, you may hear a “plink” sound coming from each jar. This indicates that the vacuum seal is forming. Don’t be alarmed if some pulp fizzes out of the jars during this process; they will likely still seal.
Let the jars sit undisturbed for at least 12 hours before checking the seals. It’s crucial to avoid moving or touching them during this time, as the sealing compound on the lids is still cooling and hardening, completing the seal.
After 12 hours, remove the bands from the jars and check the lids. Press down gently in the center of each lid. If the lid doesn’t flex or move, the jar is sealed. If the lid gives or pops down, the jar didn’t seal properly.
Any jars that didn’t seal should be placed in the refrigerator and used within a week. Properly sealed jars can be stored in a cool, dark place for up to a year.

Expert Tips & Tricks

For a richer flavor, consider roasting your tomatoes before crushing them. Roasting caramelizes the natural sugars and adds depth.
If you prefer a smoother sauce, use a food mill after crushing to remove any remaining seeds and skins.
Don’t discard the skins and cores after peeling and coring the tomatoes! Simmer them in water to create a flavorful tomato broth that can be used in soups and sauces.
If you want a little heat, add a pinch of red pepper flakes to each jar before ladling in the tomatoes.

Serving & Storage Suggestions

Home-canned tomatoes are incredibly versatile. Use them in pasta sauces, soups, stews, chili, or even as a base for pizza sauce. They’re also delicious simply simmered with garlic and herbs and served over grilled bread.

Store sealed jars in a cool, dark, and dry place. Properly canned tomatoes can last for up to a year. Once opened, refrigerate any unused portion and consume within a week.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	82 kcal	4%
Total Fat	0.9g	1%
Saturated Fat	0.1g	1%
Cholesterol	0mg	0%
Sodium	2346mg	98%
Total Carbohydrate	18g	7%
Dietary Fiber	6g	21%
Sugars	12g	24%
Protein	4g	8%

Note: Nutritional information is an estimate and may vary based on specific ingredients and preparation methods.

Variations & Substitutions

For a spicier version, add a pinch of red pepper flakes or a chopped jalapeño to each jar.
Experiment with different herbs such as oregano, thyme, or rosemary in addition to or instead of basil.
If you don’t have citric acid or bottled lemon juice, you can use white vinegar. Add 1 tablespoon of white vinegar per pint jar.
For a sweeter sauce, add a teaspoon of sugar to each jar.

FAQs (Frequently Asked Questions)

Q: Why is it important to acidify the tomatoes?
A: Tomatoes are borderline acidic, and adding acid ensures they are safe to process in a boiling water bath, preventing botulism.

Q: What does “headspace” mean in canning?
A: Headspace refers to the empty space between the top of the food and the lid of the jar. Proper headspace is essential for creating a vacuum seal.

Q: How do I know if my jars have sealed properly?
A: After cooling, the lid of a properly sealed jar will be concave and won’t flex when pressed down in the center.

Q: Can I use different sized jars for this recipe?
A: Yes, but you’ll need to adjust the processing time accordingly. Consult a reliable canning resource for accurate processing times based on jar size.

Q: What if my tomatoes separate after canning?
A: Separation is often caused by enzymes and doesn’t affect the safety of the tomatoes. Just shake the jar before using to recombine the solids and liquids.

Final Thoughts

Canning tomatoes is a rewarding process that allows you to enjoy the taste of summer all year long. It may seem a little intimidating at first, but with a little practice and attention to detail, you’ll be canning like a pro in no time. So, gather your ingredients, enlist a friend, and get ready to transform those beautiful tomatoes into jars of sunshine. Don’t hesitate to experiment with different herbs and spices to create your own unique flavor combinations. And, most importantly, have fun! Share your creations with friends and family and savor the taste of homemade goodness.

Canned Tomatoes Recipe