Step 1

For tartar sauce, in a small bowl, mix mayonnaise, relish and lemon zest. Refrigerate until serving.

Step 2

Preheat oven to 400°. Cut potatoes lengthwise into 1-in.-thick wedges; toss with oil, 1/2 teaspoon salt and 1/4 teaspoon pepper. Spread evenly in a greased 15x10x1-in. baking pan. Roast until golden brown, stirring occasionally, 40-45 minutes.

Step 3

Meanwhile, in a small skillet, toast panko bread crumbs over medium-low heat until lightly browned, stirring occasionally, 5-7 minutes. Transfer to a shallow bowl; stir in seasoned bread crumbs.

Step 4

Sprinkle cod with the remaining salt and pepper; spread top and sides of fish with mayonnaise. Dip in crumb mixture to cover mayonnaise, pressing firmly to help adhere. Place in a greased 15x10x1-in. baking pan, crumb side up. Sprinkle with any remaining crumb mixture. Bake until fish just begins to flake easily with a fork, 12-15 minutes.

Step 5

Toss potatoes with cheese and parsley. Serve fish and potatoes with tartar sauce and, if desired, vinegar.