Defrost and drain shrimp. Transfer to a bowl. Add lime, and lemon juices. Stir in cucumber, red onion and Serrano chile. Refrigerate for 1 hour. Stir in tomato, avocado and chopped cilantro. Mix gently, taste and season with salt. Allow to sit at room temperature for about 20 minutes before serving. TO SERVE: Spoon ceviche into martini glasses or small bowls. Garnish with sprigs of cilantro and slices of lime. Serve with tortilla chips or fried plantain strips.
Source: Sea Port Products Corporation