The problem with simply heating up the sealed jars is that during normal processing, the goal is to drive all air out of the headspace (the space between the food and the lid). That’s why you only put the lids on finger tight instead of cranking them on as tight as you can. While boiling, the air is forced out, and then the vacuum formed by lack of air sucks down the lid, making a tight seal. No air trapped in the top of the jar = no opportunity for microorganisms that need air to grow to spoil your salsa. If the pH is low enough, botulism (which releases spores in an anaerobic (no oxygen) environment) will also be out of commission. (For more on botulism in canning, read here – https://commonsensehome.com/botulism/.)
I started hunting around for recipes, and came up with several that looked promising, but the one I settled on was from PickYourOwn.org. I just checked the link, and they’ve changed the recipe that’s posted, but I’ll be sticking with the one I have. This makes a mild homemade salsa. In 2013, we made seven batches of home canned salsa. The “boys” love salsa, even now that they have grown up.
For a hot salsa, I use 4 jalapenos with the seeds. For a mild salsa, I seed 1-2 of the jalapenos before chopping. Remember that the heat will lessen as the salsa sits, so I tend to error on being spicy than not. However, you can taste while it’s cooking so if you want more, you can always add more. It’s hard to correct spice level so if you don’t like things spicy, then start with only 1 jalapeno and go from there.
Alright, enough talk. Let’s cook! Well, okay, one last thing before we get down to business. Please note that this salsa roja recipe uses whole, dried chilies which is my absolute preferred and highly recommended way of doing things. If, for whatever reason, you would like to use dried, ground chilies instead, you should add them near the end at step #7 in the recipe below.
Absolutely love this. You were right. Getting as much water out is so really important step. I drained as best I could with colanders then put in glass bowl. More liquid settled so I used a turkey baster to remove more liquid. Won’t ever make it another way. I have been looking for a salsa that has body and flavor and this is outstanding. I made my own tomato sauce as the tomatoes I got from local farmer were meaty and very flavorful. Thank you for posting this outstanding salsa recipe. 
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