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Prepare your equipment for canning: You need to sterilize the jars and put the lids into boiling water. You also need to have a water bath canner handy with enough water boiling in it to cover your jars by about 1".
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Chop the vegetables very finely- I use a food grinder that attaches to my Kitchenaid mixer.
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Combine zucchini with the onion, and salt in a large covered bowl. Let this stand overnight.
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Rinse the zucchini mix and drain well. Add to a large Dutch oven along with the peppers, spices and the vinegar.
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Cook just until the mixture thickens, stirring constantly. Do not overcook.
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Carefully pour this mix into hot sterilized half-pint jars, leaving 1/2" headspace.
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Carefully wipe the rims down several times to make sure that all relish is removed from the are where the cap will be sealing on the jar.
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Place the boiled lids onto the jars. Process 10 minutes in a boiling water bath- the timer starts after the water returns to a boil with the jars in the water.
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Yield: 16 half-pints.