�12 ounces (about 2 1/2 cups) medium-small, peeled-and-deveined cooked shrimp
� 1 medium white onion, chopped into 1/4-inch pieces
� 1 large tomato, chopped into 1/4-inch pieces (you should have a generous cup)
� 1/4 to 1/3 cup fresh lime juice
� Hot green chiles to taste (usually 3 serranos or 1 to 2 jalapenos), stemmed and roughly chopped
� 1 medium avocado, pitted, flesh scooped from the skin and chopped
� 1/3 cup (loosely packed) chopped cilantro, plus sprigs for garnish
� Salt
In a medium bowl, combine the shrimp, onion and tomato. Measure the lime juice into a food processor or blender. Cover and turn on. Drop in the chile(s) and, when chopped, turn off and scoop in the avocado and cilantro. Blend until smooth. Thin to a "creamy dressing" consistence with water (usually 2 to 3 tablespoons). Taste and season with salt, usually about 1 teaspoon. (You will have about 1 1/2 cups.)
Mix the dressing into the shrimp mixture. Cover with plastic wrap directly on the surface of the shrimp a la mexicana and refrigerate. When you're ready to serve, scoop into a serving bowl, decorate with a cilantro sprigs and it's ready.