The absolute easiest way to can tomatoes! This step-by-step photo tutorial will show you how to can tomatoes in no time. No peeling, no coring- just cut out the stem and dice them up. It’s super easy, plus if you grow your own tomatoes, it’s a big money saver too!
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I started canning diced tomatoes several years ago after having an “aha moment” one evening while preparing dinner. As I was opening a can of diced tomatoes that I needed for the recipe I was making, I suddenly wondered why in the world I never tried canning them myself. I mean how hard could it be?
I grew up helping my mom can tomato juice and tomato chunks. And every year since we’ve been married, I’ve canned tomato juice as well as things like salsa and marinara sauce, so I was quite familiar with the process of canning tomatoes.
I decided to give it a try and it worked like a charm! It was not only super simple, it has also saved me from needing to buy diced tomatoes from the store.
How do you can tomatoes? Let me help you learn the process!
Supplies for Canning Tomatoes
- Tomatoes, salt and bottled lemon juice
- Dishpan or containers to put the tomatoes in
- Knife (This one is my favorite for slicing tomatoes!)
- Cutting board (The groove on this one is awesome because it catches the juice, creating less mess.)
- Vidalia Chop Wizard (Not a necessity, but you can dice the tomatoes in about half the time if you use it.)
– This gadget is also awesome for dicing tomatoes, onions, and peppers for salsa and potatoes and carrots for soups. - Wide Funnel
- Damp cloth to wipe jar rims
- Water Bath Canner (or this Canning Rack may work depending on what size pot you already own)
- Canning jars with lids and rings
- Jar lifter
- Old towels or rags to set the hot jars on
How to Can Diced Tomatoes- a step-by-step tutorial
1. Wash tomatoes thoroughly.
Cut out the stem and any defects or blemishes.
Some people also peel the tomatoes, but I never do and we honestly have not noticed the peelings at all and I’m even funny about textures like that in food.
I figure, why bother with the extra step? Plus it’s a bit healthier too!
2. Cut up the tomatoes.
Slice tomatoes into about ½-inch thick slices, then dice them into whatever size you want. I love using the large dicing side of my Vidalia Chop Wizard for this!
3. Place diced tomatoes into a clean canning jar.
A funnel makes this super easy. Gently shake the jar to settle the tomatoes so that you can fill it completely.
The tomatoes should be packed tightly to produce enough juice. It won’t hurt if you press down on them a bit to get the jar packed full- in fact, this is probably going to be necessary.
The jar should be full to the base of the neck.
4. Add salt and bottled lemon juice.
For the salt, use ½ tsp. per pint and 1 tsp. per quart. You do not need to add salt when canning tomatoes, but I recommend it because I think it helps enhance the flavor.
For the lemon juice, use 1 Tbsp. per pint and 2 Tbsp. per quart.
Once the salt and lemon juice are added to the tomatoes, wipe the rim of each canning jar with a damp cloth to remove any tomato residue that may be there. (If there is even a slight bit of tomato juice on it, it may not allow it to seal properly.)
I updated the original post to include the instructions to add lemon juice after several readers commented and said that to be safe, you really should add it.
5. Prepare the canning lids. (This may be optional!)
Update: Some canning lid manufacturers now say that it’s not necessary to preheat the lids. So before doing this, check the instructions that came with the lids you are using.
Once you have 7 jars filled, place 7 metal canning lids in a small pan. Cover with water; bring to a boil.
When the water boils, use a fork or lid lifter to lift the jar lids out of the water and place them on the jars. Be careful not to burn yourself!
Secure each lid with a jar band/ring. (Heating the lids softens the rubber, allowing for a better seal.)
6. Place the filled jars of tomatoes in the canner.
Once jars are full and have the ring and lids on them, place them in the canner.
Then add hot water to the canner, enough to cover the jars by 1 to 2 inches. Cover the canner with a lid. Turn the burner to medium-high heat.
Once the water starts to boil, reduce the heat slightly and process for 45 minutes, making sure the water is boiling gently and steadily the whole time. (You may need to adjust the heat to keep the boil going nicely, but as long as it is boiling, you are fine.)
7. Remove the jars of canned tomatoes.
After processing the canned tomatoes for 45 minutes, turn the burner off.
Remove jars using a jar lifter- you may want to have a dishrag in your other hand to catch any hot water that drips from the jars as you remove them- and place on an old towel, blanket or another padded surface. (This is to protect your counter from the super hot jars.)
Allow at least a little bit of air space around each jar, making sure not to have jars close enough to touch. Do not move until the jars are completely cool.
Jars should seal as they cool and you will typically hear a snap or pinging sound as the vacuum seal is formed. The lids will be slightly concave when sealed.
To test the seal, once the jar has totally cooled you can lightly tap the center of the cooled jar lid. If it is firm and does not move, it should be sealed. If it pushes in, it didn’t seal properly. You can still use unsealed jars, just put them in the refrigerator and use them as soon as possible.
After the jars are completely cool, you can remove the rings. Jars should be wiped clean before storing them.
Enjoy!
HELPFUL TIP: 1 pint of canned diced tomatoes is equivalent to 1 (15 oz.) can of diced tomatoes.
Other canning recipes you might also enjoy:
How to Can Diced Tomatoes
Equipment
- Dishpan or containers to put the tomatoes in
- Knife
- Cutting board
- Vidalia Chop Wizard (Not a necessity, but you can dice the tomatoes in about half the time if you use it.)
- Wide Funnel
- Damp rag to wipe tops of jars
- Canner
- Canning jars with lids and rings
- Jar lifter
- Old towel, blanket or other padded surface to put hot jars on
Ingredients
- fresh tomatoes (approximately 2 3/4 lb. for 1 quart jar)
- salt (1 tsp. per quart or 1/2 tsp. per pint)
- bottled lemon juice (2 tbsp. per quart or 1 tbps. per pint)
Instructions
- Wash tomatoes thoroughly. Cut out the stem and any defects or blemishes. Some people also peel the tomatoes, but I never do and we honestly have not noticed the peelings at all- and I’m even funny about textures like that in food. I figure why bother with the extra step, plus it’s a bit healthier too!
- Slice tomatoes into about ½ inch thick slices, then dice them into whatever size you want. I love using the large dicing side of my Vidalia Chop Wizard for this!
- Place diced tomatoes into a clean canning jar- a funnel makes this super easy. Gently shake jar to settle tomatoes so that you can fill it completely. The tomatoes should be packed tightly in order to produce enough juice. It won't hurt if you press down on them a bit to get the jar packed full- in fact, this is probably going to be necessary. The jar should be full to the base of the neck.
- Add salt (½ tsp. per pint and 1 tsp. per quart) and bottled lemon juice (1 Tbsp. per pint and 2 Tbsp. per quart). Wipe rim of each jar with a damp cloth to remove any tomato residue that may be there. (If there is even a slight bit of tomato juice on it, it may not allow it to seal properly.)
- Update: Some canning lid manufacturers now say that it's not necessary to preheat the lids. So before doing this, check the instructions that came with the lids you are using. Once you have 7 jars filled, place 7 metal canning lids in a small pan. Cover with water; bring to a boil. Once the water boils, use a fork or lid lifter to lift the jar lids out of the water- be careful not to burn yourself!- and place them on the jars. Secure each lid with a jar band/ring. (Heating the lids softens the rubber, allowing for a better seal.)
- Place 7 jars in canner. Fill with enough hot water to cover the jars by 1 to 2 inches. Cover canner with a lid. Turn the burner on medium high heat. Once water starts to boil, reduce heat slightly and process for 45 minutes, making sure the water is boiling gently and steadily the whole time. (You may need to adjust heat to keep the boil going nicely, but really, as long as it is boiling, you are fine.)
- After processing for 45 minutes, turn the burner off. Remove jars using jar lifter- you may want to have a dishrag in your other hand to catch any hot water that drips from the jars as you remove them- and place on an old towel, blanket or another padded surface. (This is to protect your counter from the super hot jars.) Allow at least a little bit of air space around each jar, making sure not to have jars close enough to touch. Do not move until jars are completely cool.
- Jars should seal as they cool and you will typically hear a snap or pinging sound as the vacuum seal is formed. Lids will be slightly concave when sealed. To test the seal, once jar has totally cooled, lightly tap the center of the cooled jar lid. If it is firm and does not move, it should be sealed. If it pushes in, it didn’t seal properly. You can still use unsealed jars, just put them in the refrigerator and use them as soon as possible.
- After jars are completely cool, you can remove the rings. Jars should be wiped clean before storing them.
Laila
Hello, have a question: what type of salt is needed? It seems that you can make less than 7 jars. Loved how easy it sounds to make your own diced tomatoes. Will definitely give it a try.
Lydia Beiler
You can use table salt, fine sea salt or canning salt. If you use table salt, if you can get some that isn’t iodized, that will be best as the iodine can make the liquid cloudy and sometimes affect the color of the tomatoes a bit.
Roberta
Can I use citric acid for tomatoes instead of lemon juice
Lydia Beiler
Yes! You can use 1/4 tsp. per pint and 1/2 tsp. per quart.
Kristine Herley
Hi! I am a brand new “canner”. I tried the diced tomatoes and there seems to be a lot of liquid on the bottom of the jar (after processing) and the tomatoes are on top. Did I do something wrong?
Kristine
Lydia Beiler
No, I don’t think you did anything wrong. The liquid is merely the juice from the tomatoes. This especially tends to happen if a juicier variety of tomato is used. I’ve had it happen less often when I used tomatoes grown in a greenhouse (they are firmer) or Roma tomatoes (also firmer). In the future, if you are using very ripe, juicy tomatoes and want to try to avoid the liquid at the bottom, you can drain a bit of the juice off as you are packing the jars. I hope that helps!
Lori
Hi iam new to canning and your recipe sounds what iam looking for. My question is am I to sanitize my jars? I didn’t see it in your post and I don’t have a dishwasher to do it with. Thank you. Lori. Also I’m wanting to do juice as well. Recipe?
Lydia Beiler
No, according to the National Center for Home Food Preservation you do not need to sterilize your jars since the diced tomatoes are processed for more than 10 minutes. This is what they say, “When the process time for canning a food is 10 minutes or more (at 0-1,000 feet elevation), the jars will be sterilized DURING processing in the canner.” Just make sure your jars are clean and you should be good to go!
And here is my recipe for canning tomato juice.
Hope that helps and happy canning!
Callie
The clarity and ease of these instructions – blessings upon you and your family for a gajillion generations. This is amazing. I have a quick question. I just canned my first batch and made sure to press the tomatoes down to create enough juice to cover them all; however, now that they’re canned, the juice doesn’t cover the top part of the tomatoes. Will they still be okay? Did I do something wrong? Thank you!
Lydia Beiler
Aw, thank you, Callie! You are so very welcome. That happens occasionally to me too. They should be okay as long as just a bit of the tomatoes aren’t covered. If more than half of the liquid is lost, then I would refrigerate and use them before too long.
The tomatoes that are above the liquid may darken a bit over time, but that’s normal and okay. It’s just because of the air exposure. They are still fine to use as long as the jars are still sealed tightly.
Barbara Hake
I had next to NO luck using this method!! 5 of 7 pints didn’t seal. Liquid separated to bottom. Had to freeze 5 pts that didn’t seal. Will never use this method again. Did I have to have pt jars hot upon adding tomatoe sauce?
Lydia Beiler
I’m really sorry that you had such a bad experience, Barbara! I know how super frustrating it is to have jars not seal. I did wonder if you were referring to the correct recipe as this is for diced tomatoes and not tomato sauce. But perhaps you just got confused? If it was this recipe, it is common for the liquid to separate to the bottom. The liquid is merely the juice from the tomatoes. This especially tends to happen if a juicier variety of tomato is used. I’ve had it happen less often when I used tomatoes grown in a greenhouse (they are firmer) or Roma tomatoes (also firmer). In the future, if you are using very ripe, juicy tomatoes and want to try to avoid the liquid at the bottom, you can drain a bit of the juice off as you are packing the jars.
And no the jars do not have to be hot. The tomatoes go in at room temperature and the jars should be room temperature. I never heat my jars and have never had any issues, so I’m not sure what went wrong for you. Did you for sure wipe the rim of the jar to make sure there was no residue there that would prevent the jars from sealing? Again, I’m really sorry, as I do understand the frustration!
Carol
I followed the recipe, was so excited but when they came out of the water, there was a large separation with water on the bottom and tomatoes on the upper 2/3. Are they still good?
Lydia Beiler
Yes, they are still fine, Carol! The liquid is merely the juice from the tomatoes. This especially tends to happen if a juicier variety of tomato is used. I’ve had it happen less often when I used tomatoes grown in a greenhouse (they are firmer) or Roma tomatoes (also firmer). In the future, if you are using very ripe, juicy tomatoes and want to try to avoid the liquid at the bottom, you can drain a bit of the juice off as you are packing the jars. I hope that helps!
Jennifer
Excited to try this method. One question: table salt, sea salt or canning salt? Thanks!
Lydia Beiler
You can use any of those! I used regular table salt in the past but we switched to sea salt several years ago for regular use and that is what I have used since then. Hope the canning goes well!