The acid ingredients used in salsa help preserve it and prevent botulism poisoning. You must add acid to canned salsas because the ingredients’ natural acidity may not be high enough. Commonly used acids in home canning are vinegar and lemon juice. Lemon juice is more acidic than vinegar, but has less effect on flavor. Use only vinegar that is at least 5% acid and use only bottled lemon juice.

I haven’t yet tried your salsa recipes. I have been looking for information to can some killer cherry salsa I came up with a few years ago. Have only eaten it fresh, but wanted to can it and have some last throughout the year. So I think from some of the things I have been reading is that I need to use lemon juice, (bottled for strength consistency) to make it acidic so it will not spoil. Or perhaps vinegar. I do already use lime in my salsa, but think it must need the lemon or vinegar too. Basically I just replace tomatoes with cherries and use several different chilies and make it pretty hot.
There are some other interesting ingredients in here as well. She adds poblano peppers with the jalapeños, chicken bouillon powder instead of salt, and 1 cup of canned rotel tomatoes. She also adds chopped fresh cabbage, which I omit. The recipe will make a large bowl. You can half it if you want, but what’s the point? You’ll eat it within a few days. And if you’re making it for a crowd, it will be gone before you even serve the rest of your meal. My husband and I agree that it tastes even better the next day. Save leftovers! ENJOY!!!!

I have made this salsa for the last several summers and we love it! This year I have a bunch of extra peaches and I was wondering if you have ever added fruit to this recipe? My understanding from the class I took through the extension service is that it is not a problem to add fruit to a salsa as it is an acidic ingredient. I just wondered if you had ever tried.

Below in a comment from early August it said to get the 10 cups it would be about 8-12 tomatoes. I used about 30 medium size roma type tomatoes (filled 2 large sheet pans) and after peeling, chopping and draining I only end up with 6 cups of tomatoes. Did you meant o say 8-12lbs and not tomatoes or am I doing something wrong ? I ask because I change the ratio of ingredients off of that and do not want to mess the PH if somehow I am measuring wrong though not sure how I would be.
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 have now made 61!jars of salsa and not sure it will get us through til next summers tomatoes! For the past month my family is eating 2 jars a week, and would eat it daily if I didn’t ration it! I got some extra tomatoes this week that I was going to just quarter and can, but made the last 13 jars instead since they love it so much! I usually share my canning with friends but they won’t get much of this!I highly recommend this recipe. We like the addition of bell peppers!
IMPORTANT: Follow the directions carefully and exactly for each recipe. Use the amounts of each vegetable listed in the recipe. Add the amount of vinegar or lemon juice listed. You may decrease the amount of spices if desired. Do not can salsas that do not follow these or other research-tested recipes. These salsas may be frozen or stored in the refrigerator. Do not thicken salsas with flour or cornstarch before canning. After you open a jar to use, you may pour off some of the liquid or thicken with cornstarch.
The best way to peel tomatoes is to get a large pot of water boiling and then place the tomatoes in the boiling water for 30 seconds.  (Some suggest placing them in ice water next, but that isn’t necessary for this recipe)  When you remove the tomatoes from the boiling water their skins will start to split (you may need to assist them by piercing them with the tip of a knife) and they can then be easily peeled.
Thank you for such a well thought out recipe! I am a beginner and will be attempting your recipe today. I have some overripe tomatoes and just ripe tomatoes that would be perfect for canning. I am thinking of just doing two batches – one that I will refrigerate or eat right away and the other batch will be for canning. I have enough tomatoes to do both and I am devoted to getting them canned and store asap! Anyway – I will let you know how it turns out. You have made me hopeful that I can do it 🙂 

CAUTION: Most salsa recipes contain a mixture of low-acid foods, such as onions and chiles. Acid, such as vinegar or lemon juice, must be added to prevent the bacteria Clostridium botulinum from growing. This bacteria produces a deadly toxin (botulin) that can cause serious damage to the central nervous system or death (botulism) when eaten even in small amounts. These salsa recipes have been tested to ensure that they contain enough acid to be processed safely in a boiling-water canner.
Explain, please, about tomato peels. My tomatoes are quartered or smaller, still with peels. What are the safety consequences? Also, BTW, thanks for the update on steam canners. I’ve used one for years (and for you canning newcomers, they’re cheap at Goodwill, etc.), with the reluctant, hard-won approval of a food science pro, only on condition of his anonomity (because of that research issue). Glad to know approval is now official!