Prepare your tomatoes by peeling them. To do this you bring water to a boil, drop your tomatoes in the boiling water for about 30 seconds or until you see the skin starting to want to peel. Remove them and place them in cold water. Peel them, core them and then just kind of slice them into chunks into a pot. You can do a bunch of these at a time. Just keep peeling tomatoes and adding to your pot.
When you have all the tomatoes in your pot that you want to can bring them to a boil and boil for about 5 minutes. Spoon out into your jars leaving 1/2 inch headspace. Cover with seal and screw top lid. Be sure that the rim around the edges of the jars are clean with like a wet paper towel.(I also heat my seals in a pot of water to help them seal better before putting them on the jar).
Process in a canner or whatever pot you want to by covering the jars with as much water as possible but not above the ring and cook for about 40-50 minutes. This all depends on the altitude that you are at but you should be safe with this amount of time. Remove jars and pray that they seal! Be sure to give the rings a final check to ensure that they are tight. Give them time. I usually don't have any problem with them sealing. I cover them with a rag to let them cool off slowly, not necessary though. If you have some that don't seal after they are completely cooled down, remove the lids, clean the top of the jar and clean the lid, heat the lid again, put it back on the jar and close and then process for a short time. Just long enough to get the inside of the jars good and hot and bubbling a little. Remove. It should seal. Sometimes you may get a bad seal and have to use another seal top. Sealing may take up to 4 hrs or so depending on the temp in your home.
Good luck. I hope that you give it a try and it works great for you. It's really handy having them around. It's work but once you get the hang of it, it's easy! - Charlotte
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Canning and Preserving
From About Home Cooking, information and safety tips for home canning, including canning tomatoes.