These recipes all look very good. I will probably consult this page the next time I decide to can salsa.
I may be a heartless sinner but I use canned tomatoes. I buy the huge cans on the bottom shelf of peeled tomatoes. I also am not a huge fan of chunky salsa, so I pulse all of my veggies in the food processor to get a consistency much like a marinara sauce. I add a little bit of the liquid from the tomato can, but only when it needs it. Once you have gotten everything in the pot, bring it to a boil then simmer a good while. I don't follow this exactly but my general process is one of those giant cans(128 oz) of tomatoes to about two medium size onions(usually use sweet yellow) and 4 or so garlic cloves. I add tomato paste for smooth texture, jalapenos, salt and pepper, and different spices as it needs. I also add what I consider to be my secret ingredient, which is sriracha sauce. It will impart a delicious and interesting flavor to your salsa that has left my friends saying that they love it but it is unlike any other salsa theyve ever had. The nice thing about using the pureed vegetables is you can accurately gauge what it needs. I dont know what it is but i have just always preferred a nice thick smooth salsa rather than chunky. This process is also very forgiving, since you just play with these ingredients until you arrive at your preferred taste and texture. Fun too!
Once you have it all figured out and you are simmering for awhile, and youre happy with it, continue cooking a bit (i would say i probably simmer it for 2 or 3 hours) and take it off the heat. At this point, i add finely chopped cilantro and then you're ready to can! Run all your cans through the dishwasher, fill them up, wipe the rim, put tops on and screw lids until just tight, not as far as it will go, then since I don't have a proper canning pot I boil water in the biggest pot i have and place a metal pot lid in the bottom of it to set the jars on so they're not sitting on the bottom of the pot right atop the burner. Boil for 20 minutes, then set them on the counter and let cool. Voila.