Home canned salsa has been a staple in our home for over twenty years. We usually make at least four dozen jars to last the year. We have used the same salsa recipe for as long as I can remember. Even though it is part of the fabric of our summer canning routine, our only copy is still a hastily handwritten recipe on the back of a scrap piece of paper. The paper is ragged and dotted with spills that span the seasons.
We have made several attempts at a fully fermented salsa, but those sweet sugary tomatoes just don't hold up for very long. To me, this fresh salsa ends up tasting like Pico de Gallo that got too old. We have continued to can salsa. (Interestingly, fermented tomatillo salsa preserves well and the flavors hold for over a year, but that is another blog post.)
We love this canned salsa recipe but have always wished it were thicker. Because of the lemon juice required for the low-acid vegetables, it has always been a bit watery. Last summer, as I made the first batch, I began to think about the lemon juice. Lemon juice provides the acidity to preserve the onions, peppers, and garlic, and insures that the tomatoes are acidic enough. I began to wonder—if I fermented the low-acid ingredients first, could I avoid the extra lemon juice? The two cups are a significant amount. I decided that next time I would try that. I checked the pH level of the “approved” recipe and put that aside. In a few weeks it was time to make another batch of salsa, so Christopher and I prepared everything but the tomatoes. We put this in a crock and fermented it for a week. When this pepper-onion mixture was ready, we prepared the salsa as usual. We tasted it and the flavors were balanced; the lemon flavor was not noticeably missing. Before jarring it, I checked the pH level and it came out the same as the original recipe, but the salsa was not the same. It was nice and thick.
This recipe makes 18 - 20 pints of canned salsa. These are processed in a water bath canner. We are assuming, if you are interested in this recipe, that you have some experience in home canning techniques. If not check here. See the ferment and pickle pages at you can also download a PDF of the USDAs Complete Guide to Home Canning.
This recipe takes place in two sessions about a week apart. You will not need the tomatoes until after the rest of the ingredients have fermented.
7 quarts chopped tomatoes
4 cups chopped green chilies
5 cups onions, diced
½ cup jalapeños, diced
10 cloves garlic, grated
2½ tablespoons salt
1 tablespoon ground black pepper
2 tablespoons ground cumin
3 tablespoons oregano
3 tablespoons chopped fresh cilantro
Week one: Prepare all of the vegetables and spices except the tomatoes. Salt and place in a jar or crock to ferment for a week.
Week two: Prepare the tomatoes and place them in a large stainless steel stockpot. Bring this to a boil. Simmer the tomatoes for 10 minutes. Add the fermented veggie mixture and bring back to a boil. Simmer for another 20 minutes. Follow USDA instructions for hot-packing salsa and canning in a water bath.
Ladle into hot sterilized jars. Process the jars in a water bath for 20 minutes.