Chipotle Lime Cod Fish Tacos

Name: Chipotle Lime Cod Fish Tacos
Ingredients: Beer Batter:; 1 cup all-purpose flour; 2 tablespoons cornstarch; 1 teaspoon baking powder; 1/2 teaspoon kosher salt; 1/4 teaspoon garlic powder; 1/4 teaspoon cayenne pepper; 8 ounces Mexican beer; 1 egg; Chipotle-Lime Sauce:; 1/2 cup mayonnaise; 2 canned chipotle peppers in adobo sauce, seeded and minced; 1 tablespoon adobo sauce from chipotle peppers; 1/2 lime, juiced; oil for frying; 1 pound cod fillets, cut into 2-inch chunks; 1/3 cup all-purpose flour; 1/8 teaspoon kosher salt; 1 (10 ounce) package 6-inch flour tortillas; 1 head lettuce, shredded; 1 (8 ounce) package crumbled queso fresco; 1 tomato, diced; 1/2 red onion, diced; 1/4 cup chopped fresh cilantro; 1 fresh lime, cut into wedges