Lemon is more acidic than vinegar. If you replace the vinegar with lemon, it should be fine. If the pH is too high and you’re breeding botulism spores, there would be no obvious signs of the problem. If the pH is low enough to prevent botulism (4.6 or lower), spoilage would be likely be indicated by mold growth, bulging lids or other obvious signs of spoilage. If reprocessing is needed, it should be done within 24 hours.
If I could suggest–instead of all the calculating and worry about PH in this, or other recipes due to minor changes–I bought an electronic PH liquid meter from Amazon for about $12.99 and you just dip it in the liquid food, pool, or aquarium–and instant PH! Your salsa with my lime juice exchange was a comforting 3.6 PH. I would never just make up a canning recipe and depend on that inexpensive meter to be safe, but it lets me double check on all my tomatoes & water bath canning and the recipes I carefully choose for safety from Pinterest.
I am going to try this recipe today using roma tomatoes. I just wanted to add, most recipes call for de-seeding and squeezing out all tomato juice from the tomatoes. I have learned that you can cook down the juice and seeds, ( one year I had 2 quarts of tomato liquid …slowly cooked down to 1 half pint ) this way all my ingredients were fresh garden and not canned. The thickened tomato seed juice was so close to paste that it thickened the salsa I made. I just incorporated it into my tomatoes measurements. Trying that with your recipe. Ty
This is a fantastic recipe and I love the tip to broil the tomatoes to peel them….it worked great! I ended up using about 35 medium size vine grown tomatoes to make 10 cups of chopped, drained tomatoes. We don’t care for cilantro, so I substituted Italian parsley instead. I also added 1 or 2 tablespoon of lime juice in place of some of the vinegar. Love the flavour of this salsa and will definitely make this recipe again.
Blanch and skin the tomatoes. To blanch tomatoes, place them in boiling water for 30 to 60 seconds, until the skins start to split. As soon as the skins start splitting, remove the tomatoes and place them in a cold water/ice water bath. This stops the cooking so they don’t get mushy, and makes them cool enough to handle for peeling. Slip off skins.
Hi Holly – I’m honestly not sure in regards to food safety. From what I understand, the ingredients that can be altered without affecting food safety are: leaving out the tomato paste (not sure about the tomato sauce), altering the spices like cumin and salt and cilantro, etc., and modifying the amount of jalapenos. I don’t know the pH of radishes and how the would sub in for green peppers – and of course the amount of tomatoes and vinegar (for the main acidity) need to stay the same.
My first experience with canning salsa (around 17 years ago, I think), included recipes from the Ball Blue Book (one batch of each) and some “mild” Tam jalapeno peppers. Those “mild” peppers ate through two pairs of rubber gloves and filled the house with fumes so strong that I could hardly breathe and my husband started tearing immediately as he soon as he entered the house when he came from work. The salsa was thin and watery, strong on vinegar, and not too tasty. I gave up on home canned salsa for quite a few years – I couldn’t put myself through that again.
I just made my 4th batch of this salsa tonight. We have a huge vegetable garden and have been making it when enough tomatoes ripen. Absolutely love this recipe. I followed it exactly and have made 36 pint size jars. Have given away about half so I will make another 2 batches when the rest of the tomatoes are ready. Everyone loves it. Thank you so much for sharing this and the perfect instructions you gave!
I added a tea spoon of fine ground hot pepper. now thats the slight hot I like and no tomato paste. I like it wet …Great recipe. the first time I ever made salsa and I am glad I found the perfect recipe.. on top of it all. its just like a recipe of a so called semi friend. that had his own recipe I liked and he wouldnt give it up. well ..he can bite this. now!! I got it. if not better ..ha ha !! you and your grand mother knew your stuff… Thanks !! 
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