Shrimp Ceviche    Ingredients:  2 lbs cooked shrimp (peeled, deveined with tails off)  ¾ cup fresh lime juice  3 roma tomatoes (diced)  1 white onion (chopped)  ½ cup fresh cilantro (chopped)  1 tablespoon Worcestershire sauce  1 tablespoon ketchup  1 teaspoon hot pepper sauce  salt and pepper (to taste)  1 avocado (peeled, pitted and diced)  tortilla chips
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