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jars and lids in water bath: Place steamer rack in the bottom of a large (16-qt) stock pot or canning pot. Place new or clean mason jars on the rack. Fill the jars with water and fill the pot with just enough water to come to the top of the jars. Heat water to a simmer. Simmer for 10 minutes. (Keep the jars warm while preparing the salsa.)Have a kettle half filled with water ready to boil, to use to sterilize the jar lids a few minutes before canning.
Roast chile peppers: Roast the Anaheim green chile peppers until blackened all over. The best way to do this is directly over a gas flame on the stovetop (see how to roast chiles over a gas flame.) If you don't have a gas cooktop you can broil the chiles, or blister them on a grill.Note that it is not essential that the chile peppers be cooked through, only that the outer tough skin is blistered and blackened. This is what will help with flavor. Also it will make it easy to peel the chiles.Just put the chiles near a heat source until blistered and blackened, and turn them so that they get blackened on all sides. Then place the chiles in a brown paper bag (or in a covered bowl), close the bag and let the chiles steam in their own heat for a few minutes.Then gently rub off the outer skin and discard. Cut away the stems and remove the seeds and any prominent veins.Chop up the chiles and set aside; you should have 1 cup of chopped chiles. Do not use more than 1 1/2 cups of chopped chiles.
Prepare the tomatoes: You want the tomatoes peeled, and there are several ways of doing that. Blanching them is easiest; grilling or broiling will result in more flavor.To blanch them, score the ends of the tomatoes and place them in boiling water for a minute.If you are going to grill or broil the tomatoes, I recommend coring them first. Grilling is best with whole plum tomatoes; grill them on high direct heat until blackened in parts and the peels are cracked. Broiling works with any sized tomato. Just cut them in half and place the cut side down on a rimmed baking sheet or roasting pan. Broil until the peels are blackened in parts.Remove the tomatoes (from water, grill or broiler) and let cool to the touch. Remove and discard the peels. Cut away any cores if you haven't done so already. Chop the tomatoes taking care to save any juices that may come out of them.Starting with 5 pounds of tomatoes you should end up with about 8 cups of chopped tomatoes and juices. (You must use at least 7 cups of tomatoes.) Place them in a bowl and set aside.
Simmer all ingredients in a large pot: Put all of the ingredients into a large (8-qt) stainless steel pot. (Do not use aluminum or the acidity of the sauce will cause the aluminum to leach into the sauce.)Bring to a boil, reduce to a simmer. Cook uncovered for about 10 minutes.
Sterilize jar lids: While the salsa is cooking, place the jar lids in a bowl and cover with boiling water to sterilize.
Blend salsa if you want it to be more smooth: If you want your salsa to be more smooth than chunky, use an immersion blender to pulse it a few times, or working in batches ladle about half of it into a blender and purée.
Adjust seasonings: If too acidic to taste, add more sugar to balance the vinegar! If too sweet, add a bit more vinegar.
Ladle salsa into canning jars and seal: Ladle salsa into canning jars, leaving 1/2-inch head space. Wipe the rims with a clean, dampened paper towel so that there is no residual food on the rims.Place canning lids on the jars. Screw on the lid rings. Do not over-tighten or you may not get a good seal. Air does need to escape from the jars during the next step, the water bath.
Boil in a water bath: Place the filled and lidded jars back onto the rack in the large stock-pot of hot water you used to sterilize the jars in step one. You may need to remove some of the water from the pot to prevent it from overfilling.Cover the jars with at least 1-inch of water. Bring to a rolling boil and process for 15 minutes (20 minutes for altitudes 1000 to 6000 ft, 25 minutes above 6000 ft). Then turn off heat and let the jars sit in the hot water for 5 minutes.
Let jars cool, lids should pop: Remove jars from the water bath and let sit on a counter for several hours until completely cool. The lids should "pop" as the cooling salsa creates a vacuum under the lid and the jars are sealed.If a lid has not sealed, either replace the lid and reprocess in a water bath for another 15 minutes, or store in the refrigerator and use within the next few days.Remember to label the cans with the date processed. (I use a Sharpie on the lid.) Canned salsa should be eaten within a year.