Easy Water Bath Canning for Diced Tomatoes: A Homegrown Pantry Staple
There’s nothing quite like cracking open a jar of sun-ripened, home-canned tomatoes in the middle of winter. Whether you’re making soups, stews, or pasta sauce, home-canned diced tomatoes bring the taste of summer right into your kitchen—no matter the season. Even better, with just a few simple ingredients—Roma tomatoes, lemon juice, and salt—you can preserve garden-fresh flavor and nutrition for months to come.
If you’re new to canning, don’t worry. To begin with, water bath canning is a safe and accessible method for preserving high-acid foods like tomatoes. It doesn’t require expensive equipment or a pressure canner, and the process is surprisingly simple once you understand the steps.
Why Make Your Own Canned Diced Tomatoes?
First and foremost, making your own canned tomatoes allows you to control the quality and ingredients. Store-bought canned tomatoes often contain preservatives, citric acid, calcium chloride, and other additives. In contrast, home-canned tomatoes include only what you choose to add—nothing more, nothing less.
Benefits of home canning:
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Cost-effective when tomatoes are in season
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Free from preservatives and BPA-lined cans
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Packed with flavor and peak-season freshness
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Zero waste when using homegrown or local produce
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Long shelf life, when stored properly
Additionally, water bath canning is beginner friendly. Once you learn the technique, you’ll wonder why you didn’t start sooner.
Why Roma Tomatoes?
When it comes to canning, not all tomatoes are created equal. Roma tomatoes, also known as plum tomatoes, are the gold standard for canning—and for good reason.
Here’s why Roma tomatoes are best:
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Meaty texture with fewer seeds
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Significantly lower moisture content
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Naturally rich flavor
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Thin skins
Because of their dense flesh and low water content, Roma tomatoes hold their shape well after canning, making them ideal for diced tomatoes in particular.
How to Water Bath Can Diced Roma Tomatoes: Step-by-Step
Canning diced Roma tomatoes is straightforward, especially when you follow a safe and proven method. Here’s exactly what you’ll need and how to do it.
Ingredients:
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Fresh Roma tomatoes (about 1-1.25 lbs per pint jar)
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Bottled lemon juice (1 tbsp per pint)
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Canning salt (1/2 tsp per pint)
Equipment:
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Large pot or canner for the water bath
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Canning jars, lids, and rings
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Jar lifter, funnel, and bubble remover tool
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sharp knife
Instructions:
1. Prepare the Jars
First, wash your jars, lids, and rings in hot, soapy water. Then, sterilize the jars by placing them in a simmering water bath (not boiling) for 10 minutes. Keep the jars warm until you’re ready to fill them.
2. Dice the Tomatoes
Once peeled, core and dice the tomatoes to your desired size.
3. Pack the Jars
Add the lemon juice and salt directly into the bottom of each jar. Then, pack the diced tomatoes in, leaving 1/2-inch headspace. Add any juice released during dicing to fill the jar, still maintaining headspace.
4. Add Water and Remove Air Bubbles
Add boiling hot water into the jars maintaining 1/2-inch headspace. Run a bubble remover along the inside edge of the jar to release trapped air. Adjust headspace if necessary.
6. Wipe and Seal
Wipe the rims with a dry paper towel. Place lids on jars and screw on bands until fingertip tight.
7. Process in Water Bath
Submerge jars in boiling water so that they are covered by at least 1 inch of water. Process for 35 minutes for pint jars. (Adjust for altitude if necessary.)
8. Cool and Store
After processing, remove jars and place them on a towel to cool. Listen for the “ping” sound that indicates a successful seal. Let them sit undisturbed for 12–24 hours. Then check seals, label with date, and store in a cool, dark place.
Health Benefits of Homegrown Canned Tomatoes
Now that you know how to make them, why should you be eating them?
1. Rich in Lycopene
Tomatoes are one of the best sources of lycopene, a powerful antioxidant linked to lower risks of heart disease and certain cancers. Interestingly, lycopene becomes more bioavailable when tomatoes are cooked or canned, making your preserved tomatoes even more beneficial.
2. High in Vitamins and Minerals
Home-canned tomatoes are packed with:
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Vitamin C for immune support
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Vitamin A for skin and eye health
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Potassium for heart health
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Folate for cell regeneration
Because you’re preserving at the peak of ripeness, the nutritional value remains high—far better than out-of-season grocery store tomatoes.
3. Low in Calories, Big on Flavor
In fact, one cup of diced tomatoes contains only about 30 calories, which makes them an excellent addition to low-calorie, high-nutrient meals. Even better, they add bold, rich flavor without contributing any guilt to your plate.
What Can You Use Canned Diced Tomatoes For?
Once you have a pantry full of these ruby-red jars, the possibilities are endless. Because they’re so versatile, you can use them in:
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Chili, soups, and stews
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Pasta sauces and casseroles (Cheesy Tex Mex Skillet)
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Taco fillings
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Pizza sauce base
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Stuffed peppers (Low Carb Stuffed Peppers) and lasagna
Having ready-to-use tomatoes on hand saves time and eliminates the need for last-minute grocery runs.
A Simple Tradition Worth Starting
In conclusion, water bath canning diced tomatoes is a practical, rewarding, and healthy way to preserve your harvest. With just three simple ingredients—Roma tomatoes, lemon juice, and salt—you indeed can create a pantry staple that’s bursting with flavor and loaded with nutrients.
Not only is this method cost-effective and customizable, but it’s also a fantastic introduction to home food preservation. Plus, you gain the peace of mind that comes with knowing exactly what’s in your food.
So, whether you’re a gardening enthusiast, a meal prepper, or someone who just loves real food, now is the perfect time to start canning. You’ll be thankful in the middle of winter when you pop open a jar and taste summer all over again.
Do You Have an Abundance of Tomatoes and Need More Ideas for Canning? Try These Recipes!
Diced Tomatoes
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Equipment
Ingredients
- 40 Large roma tomatoes (approximate)
- 12 tbsp Lemon juice
- 6 tsp Canning salt
- Boiling water
Instructions
- Wash the canning jars, lids, and bands in hot soapy water.
- Fill the water bath and bring to a boil over high heat.
- Fill the electric kettle with water and bring to a boil.
- Add 1 tablespoon of lemon juice and 1/2 tsp of canning salt to each jar.
- Dice the roma tomatoes and fill each jar, leaving 1/2 inch head space.
- Fill each packed jar with boiling water.
- Using the bubble popper, remove any trapped air and add water if needed.
- Wipe the rim of each jar with a clean dry paper towel.
- Place the lids on the jars and tighten the bands fingertip tight.
- Using the jar lifter, place the jars into the water bath.
- Cover the water bath and allow the jars to process for 35 minutes for sea level canning. Adjust for altitude if needed.
- Remove the jars to a towel lined cutting board and allow to cool for 12 hours before labeling and storing.
- If any jars do not seal, they should be refrigerated and used first.
Nutrition
