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Wash tomatoes; cut out stem ends and quarter lengthwise.
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Wash and seed peppers; quarter.
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Peel and quarter onions.
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Process vegetables in a food processor until they are chopped small.
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Place vegetables in a colander over a bowl to drain off liquid (discard liquid).
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Place vegetables in a saucepan with 2 quarts of vinegar; boil, uncovered, 30 minutes, stirring often.
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Strain vegetables again, discarding liquid and return to saucepan.
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Stir in 1 quart vinegar and remaining ingredients; simmer 3 minutes.
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Pour into clean, hot, sterilized preserve jars.
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Fill to within 1 inch of top; seal using your preferred method (my usual method is to scale the recipe down to 1 jar and refrigerate!).