Shrimp with Green Chiles & Avocado-Tomatillo Sauce

Ingredients

• 1/2 pound tomatillos—husked, rinsed and quartered
• 1 small onion, coarsely chopped
• 1 large serrano chile, seeded and coarsely chopped
• 2 garlic cloves
• 1/4 cup packed cilantro leaves
• 1 Hass avocado, halved and pitted
• 2 tablespoons fresh lime juice
• Salt
• 1/2 cup extra-virgin olive oil
• 1 large onion, finely diced
• 8 garlic cloves, halved and very thinly sliced
• 6 jalapeños, halved, seeded and thinly sliced
• 2 pounds medium shrimp, shelled and deveined
• 1 teaspoon salt
• 2 teaspoons freshly ground black pepper
• 2 tablespoons mayonnaise
• Warm corn tortillas, for serving
• Diced tomatoes, for serving
• Lime wedges, for serving
• Cilantro leaves, for serving