How to Make It
Place the fish stock or water, onion, garlic, bay leaves, peppercorns and 1 teaspoon of salt in a medium-sized saucepan or small stockpot. Bring to a boil over high heat, cook uncovered for 10 minutes to infuse with the flavors. Add the shrimp and cook, uncovered, for about 2 minutes, or until the shrimp turn pink. Quickly cool by emptying into a colander set under cold running water. Drain thoroughly. Peel the shrimp and cut lengthwise into halves.
In a small bowl, combine the lime juice and olive oil with a generous grinding of black pepper and about 1/2 teaspoon more salt. Place the shrimp in a large bowl with the bulb onion, chilies, avocado and cilantro. Pour the lime juice dressing over the salad ingredients and toss to distribute evenly. Taste for seasoning and add a little more salt and pepper if desired. Serve at once.
VARIATIONS: The same recipe works well with virtually any kind of seafood, though each has to be cooked by its own optimum timing. For Ensalada de Calamares (Squid Salad) start with about 1 to 1 1/2 pounds of cleaned squid. Peel off the outer membrane and cut the squid into 1/2-inch chunks or rings. Cook as directed for shrimp, or until tender. Continue as directed.