INGREDIENTS
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1 (25.6-ounce) package frozen meatballs, thawed
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1 cup frozen chopped onion
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2 (28-ounce) cans crushed tomatoes
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2 (14.5-ounce) cans organic diced tomatoes with basil and garlic
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1 tablespoon Italian seasoning
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1 tablespoon balsamic vinegar
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2 teaspoons prepared minced garlic
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1/2 teaspoon crushed red pepper
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14 ounces uncooked spaghetti
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freshly grated Parmesan cheese (optional)