Fancy Fish and Zucchini Fries

Name: Fancy Fish and Zucchini Fries
Ingredients: Vegetable oil, for frying; 1/2 cup milk; Juice of 1 lemon; 1/2 cup cornstarch; 1 teaspoon kosher salt; 2 medium zucchini (1 pound total), cut into 3-by-1/2-inch batons; Sea salt flakes, for sprinkling; 2 cups all-purpose flour; 2 teaspoons kosher salt and pinch black pepper; 1/4 cup cornstarch; 2 teaspoons baking powder; One 12-ounce bottle brown ale; 1 1/2 pounds cod, haddock or pollock fillets, cut into finger-size strips; Store-bought tartare sauce; Lemon wedges; 1 small bunch of fresh parsley