Chipotle Lime Cod Fish Tacos

Name: Chipotle Lime Cod Fish Tacos
Ingredients: 1 cup all-purpose flour; 2 tablespoons cornstarch; 1 teaspoon baking powder; 0.5 teaspoon kosher salt; 0.25 teaspoon garlic powder; 0.25 teaspoon cayenne pepper; 8 ounces Mexican beer; 1 egg; 0.5 cup mayonnaise; 2 canned chipotle peppers in adobo sauce, seeded and minced; 1 tablespoon adobo sauce from chipotle peppers; 0.5 lime, juiced; oil for frying; 1 pound cod fillets, cut into 2-inch chunks; 1/3 cup all-purpose flour; 0.125 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; 0.5 red onion, diced; 0.25 cup chopped fresh cilantro; 1 fresh lime, cut into wedges