Heat 2 tsp oil in a large skillet over medium-high heat. Add bacon; saute 3 minutes. Add onion and remaining 1 tsp oil; lower heat to medium. Cook, stirring frequently, 5 minutes or until onion is softened. Add tomatoes, tomato sauce, vinegar, 1/2 tsp salt and pepper. Lower heat; simmer 15 to 20 minutes or until sauce is thickened.
Meanwhile, cook shells in a large pot of lightly salted boiling water until al dent
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