1 c. ketchup
1 c. vinegar
1/2 c. oil
1 tbsp. Worcestershire Sauce
1 onion thin sliced
2 tbsp. dry mustard
2 Bay Leaves
2 lbs. shrimp, cooked and peeled

Mix all ingredients except shrimp to make marinade. Add shrimp marinate at least 8 hours. Remove Bay Leaves and serve.