Chipotle Shrimp Taco with Avocado Salsa Verde

Name: Chipotle Shrimp Taco with Avocado Salsa Verde
Ingredients: 1 small onion, quartered; 1 jalapeno, quartered, seeds optional; 1 garlic clove, smashed; 4 medium tomatillos, (about 8 ounces) husked, rinsed, and coarsely chopped; 1/2 Hass avocado, peeled, seeded, and cut into chunks; 1 1/4 teaspoons kosher salt; 1/4 cup loosely packed fresh cilantro leaves, coarsely chopped; 1 tablespoon olive oil; 1 teaspoon chipotle or blended chili powder; 1 teaspoon kosher salt; 1 pound medium shrimp (about 20), peeled and deveined; 8 corn tortillas; 8 sprigs cilantro for garnish; 2 limes, cut into wedges