INGREDIENTS
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tablespoons olive oil
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large yellow onion, finely chopped ( 3/4 cup)
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cloves garlic, finely chopped
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large celery stalk, finely chopped ( 3/4 cup)
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teaspoons salt, divided
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teaspoons dried oregano
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tablespoon tablespoon tomato paste
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28-ounce cans whole tomatoes and their juice
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teaspoon sugar
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tablespoons butter