Place a rack in the bottom of a large stockpot and fill halfway with water. Bring to a boil over high heat, then carefully lower the jars into the pot using a holder. Leave a 2 inch space between the jars. Pour in more boiling water if necessary until the water level is at least 1 inch above the tops of the jars. Bring the water to a full boil, cover the pot, and cook for 30 more minutes.
I read some comments below and came back for a quick reply.. I noticed someone questioning the sugar in the recipe. Please dont omit it. You cant taste the sweetness at all. It is necessary for the salsa to retain its color in the jars for a longer period of time. My late Mother was a GREAT home-,maker and I will never be quite as good a ‘canner’ as she was, but she swore that if you leave out the sugar, that the salsa will darken quicker.
I used the suggestion to use about half the cooking liquid maybe less. It turned out as expected for me. I used a variety of very ripe homegrown tomatoes and homegrown serrano chiles. Flavor was great. I used a Vitamix to completely blend everything so skins and seeds disappeared. The Vitamix lets steam escape so no issue in blending hot ingredients.
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.