Beer Battered Fish and Chips with Spicy Tartar Sauce

Serves:

• FOR THE BEER BATTER:
• 1 1/2 cups all-purpose flour
• 1/2 cup cornstarch
• 1/2 teaspoon baking powder
• 1 12-ounce bottle ice cold lager beer
• 1 teaspoon kosher salt
• 1 1/2 pounds cod fillets, boneless, skinless
• 1 cup all purpose flour, for dredging
• 4 large Russet potatoes, cut into fries
• Vegetable oil, for deep frying
• FOR THE SPICY TARTAR SAUCE:
• 1 cup mayonnaise
• 1/2 cup sour cream
• 1 tablespoon sriracha
• 1 teaspoon honey
• 1/4 cup finely chopped pickles
• 2 tablespoons pickle juice
• 2 tablespoons finely chopped flat-leaf parsley
• Kosher salt and freshly ground black pepper