INGREDIENTS
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3 pounds Roma tomatoes, quartered (10 to 12 tomatoes)
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1 cup sugar
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1/4 cup light corn syrup
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2 tablespoons apple cider vinegar, plus more if needed
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1/2 teaspoon ground allspice
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1/4 teaspoon whole black peppercorns
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4 cloves garlic, smashed
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1 medium red onion, quartered
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Kosher salt