One of the hardest things I frequently have to tell people is that they can't just put their beloved fresh salsa recipe in a jar and preserve it. Because salsa contains so many low-acid ingredients, you've got to balance them out with plenty of acid to ensure a safe product. I offer up this salsa recipe as balm to that particular disappointment. Though it's cooked and not fresh, it manages to retain some of the same bright, fiery flavors and is miles better than any cooked salsa you'll find on your grocery store shelves.
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Jars should be made from glass and free of any chips or cracks. Preserving or canning jars are topped with a glass, plastic, or metal lid, which has a rubber seal. Two piece lids are best for canning, as they vacuum seal when processed.
To sterilize jars, before filling with jams, pickles, or preserves, wash jars and lids with hot, soapy water. Rinse well and arrange jars and lids open sides up, without touching, on a tray. Boil the jars and lids in a large saucepan, covered with water, for 15 minutes.
Use tongs when handling the hot sterilized jars, to move them from boiling water. Be sure the tongs are sterilized too, by dipping the ends in boiling water for a few minutes.
As a rule, hot preserves go into hot jars and cold preserves go into cold jars. All items used in the process of making jams, jellies, and preserves must be clean. This includes any towels used, and especially your hands.
After the jars are sterilized, you can preserve the food. It is important to follow any canning and processing instructions included in the recipe and refer to USDA guidelines about the sterilization of canned products.