"Refrigerate extra ketchup in an airtight container for up to a week...."
INGREDIENTS
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1 tablespoon extra-virgin olive oil
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3/8 teaspoon kosher salt, divided
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2 pounds small tomatoes, quartered
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3 tablespoons chopped fresh basil
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2 teaspoons balsamic vinegar
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1/2 teaspoon sugar
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1/4 teaspoon ground red pepper