Fried Fish Sandwich

Name: Fried Fish Sandwich
Ingredients: Vegetable oil, for frying; 1 cup cornmeal; 1 cup all-purpose flour; 1 tablespoon baking powder; 1 tablespoon kosher salt; One 12-ounce bottle amber beer, such as Dos Equis; 2 teaspoons hot sauce, such as Tabasco; Two 6-ounce tilapia fillets, cut in half; Kosher salt and freshly ground black pepper; Lemon Tarragon Tartar Sauce, recipe follows; 4 soft potato rolls, such as Martin's; 1 head green leaf lettuce; 4 slices American cheese (optional); Lemon wedges, for serving; 1 cup mayonnaise; 2 tablespoons minced bread and butter pickles; 2 tablespoons minced scallions; 1 tablespoon capers, drained and coarsely chopped; 1 tablespoon minced fresh tarragon; 1 teaspoon stone ground mustard; Zest of 1 lemon; Juice of 1/2 lemon; Kosher salt and freshly ground pepper