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in a large skillet, heat oil over medium heat.
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add onion, celery and pepper; cook and stir 5-7 minutes or until tender.
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add garlic; cook 1 minute longer.
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stir in tomato sauce, diced tomatoes, water, worcestershire sauce and cayenne; bring to a boil.
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reduce heat; simmer, uncovered, 10-15 minutes or until slightly thickened, stirring occasionally.
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add shrimp; cook 2-4 minutes or until shrimp turn pink.
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serve with rice.