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Saute the onion, garlic, olive oil and apple together in a medium sized saucepan until the onions and apples have softened.
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Add the crushed tomatoes.
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Simmer together until the sauce is reduced by 1/4 , then add all of the remaining ingredients for the sauce.
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Simmer all together over low heat for about a half hour or until the sauce reaches the consistency of a good barbeque sauce. I like mine a little thicker than most because it is easier to brush on whatever is being grilled. Puree the sauce to make it extra smooth if you prefer. I always do.
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Store in airtight container in the fridge if you are using it within a week or so or freeze it in airtight containers. Properly preserving it in mason jars will make it last all summer.