Hi Heather – from all the reading I did on that recipe, the lady who created the recipe, Annie, developed it and had it tested at her local extension office years ago. There are a lot of threads on the Garden web forum – I looked for a few minutes and couldn’t find the original thread I had read but here’s a couple that might help (there’s LOTS of discussion on there about the proper way to make the salsa without messing up the pH levels and making it unsafe):

Several questions: Can I microwave the jars, rings, lids and sealer; and can safely? What about Cherry Tomatoes substitution? What are the best tomatoes for making paste, best tomatoes for canning whole tomatoes. I have read all the comments. I have not tried your recipe, however I will tomorrow as my tomatoes are dangerously close to being too soft. Your site is awesome. Thanks for you time.
Ever since my return from California, I knew Mexican Food was something I had to perfect at home. A noble cause since I knew next to nothing about cooking back then and had no idea about procurement and use of special ingredients. For nearly 15 years, though, I have tried. For nearly 15 years I’ve experimented, failed, learned my lessons and adjusted… To a point where I now feel reasonably confident doing what I joked about upon leaving sunny Southern California: Writing a Beginner’s Guide To Mexican Food.

I’ve tried the recipe both ways simmering and no simmer. I like the no simmer only because it tastes a bit more fresh. I add the garlic and just a bit of lime juice. Was wondering whether or not it requires refrigeration. I’ve heard that storing tomatoes in the fridge is not good for them. My wife wants me to make a batch for her to enter in the salsa cook off at her school. Making over and over while the fresh tomatoes are in season
Combine all ingredients in a large saucepan and stir frequently over high heat until mixture begins to boil, then reduce heat and simmer for 20 minutes, stirring occasionally. Ladle hot salsa into pint jars, leaving 1/2-inch headspace. Adjust lids and process in a boiling-water canner for 15 minutes at 0–1,000 feet elevation, 20 minutes at 1,001–6,000 feet, and 25 minutes above 6,000 feet.
Hi Kari. The tomatoes in the can are small to medium sized tomatoes, and there are plenty in there. I tested the recipe using canned, not fresh, so I can’t say for absolute certain, but my best guess would be to start with 8 small to medium tomatoes and make the salsa as directed. Taste it and use your best judgement as to if it needs more tomatoes or not.
I’ve never attempted to use canned tomatoes in the recipe, and can’t remember the last time I purchased store tomatoes, so I’m not sure how much liquid is in there in proportion to the fruit. My best guess to make this work would be to drain the tomatoes and then weigh them – but this would be a little high since the starting weight with raw tomatoes includes skins, seeds and excess juice that’s removed/drained off. Maybe around 16-80 pounds drained tomatoes? When I’ve drained my tomatoes after chopping, I end up with around 7 quarts in volume. There is no simple answer, unfortunately. If you give it a go, you may way to get pH strips to test the finished salsa and make sure the pH is below 4.6 for safe canning. If not, you could freeze, or add more vinegar.
I never respond to blogs, but feel this is one that needs a response. Made this salsa and have to admit this IS the best salsa ever. It was so good fresh and canned. I can’t get enough of it. Am going to make it again. I have shared this recipe already. My husband loves everything so hot, but I left out many of the seeds, so I could enjoy it. Told him he could add habenero’s, ghost peppers, carolina reapers or whatever to his. I am just going to enjoy and savor the flavor of this salsa. Thank you so much. No more store bought. (oh, I added yellow goathorn peppers in lieu of the green peppers and added 3 extra garlic cloves)… it was just great 

I have not made your salsa recipe yet, but am going to try it when my tomatoes are ready! I wanted to ask if you have ever used the oven to process your canning? Or know any food safety issues about using it? Would love to hear your thoughts and recommendations! Someone suggested it to me years ago and I thought it made sense, same temp as boiling water and in the oven for same amount of time, or longer maybe. Thanks
Thanks for such a great, informative website in regards to canning! We homeschool and I am teaching our kids a unit on canning. I’d done plenty of canning before but had always been scared/intimidated to modify recipes in the LEAST because I didn’t understand the science behind the process. Thanks to your website I’m starting to understand a lot more!!! This is especially helpful to be able to explain things to my science-minded “why” kid who wants to know EVERYTHING! I can’t wait to try more of these recipes!
I just made this wonderful salsa a couple of days ago with roma tomatoes. I 4X the recipe and ended up with 32 pints of salsa. We liked it so very much I am thinking of doing more with the 1 1/2 bushels of regular tomatoes that I have. Do you think that the regular tomatoes would have too much liquid in them or would the draining take care of that problem? I didn’t add the paste last time so I would probably add it for sure to make it thicker.
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