Crispy Cerveza Battered Fish

Name: Crispy Cerveza Battered Fish
Ingredients: Vegetable oil, for frying; 2 1/2 cups all-purpose flour; 1/3 cup cornstarch; 1 tablespoon kosher salt; 2 teaspoons cayenne pepper; 1 teaspoon smoked paprika; 1 teaspoon baking powder; 1 teaspoon freshly ground black pepper; Two 12-ounce bottles Mexican lager; 2 pounds cod, cut into 1/2-by-1 1/2-by-3-inch sticks; 12 flour tortillas (7-inch); 2 cups shredded napa cabbage; 1 cup finely diced red onion; 1 cup fresh cilantro sprigs; 1 cup lime wedges; Charred Lime Crema, recipe follows; 2 jalapenos; 1 small white onion, peeled and cut into 1/4-inch rounds; 2 tablespoons olive oil; 1 cup fresh cilantro leaves, plus more for garnish; Kosher salt and freshly ground black pepper; 1 cup Mexican-style crema; 1 lime, zested and juiced