Walnut Spice Cake 1 cup vegetable shortening, plus more for pans 3 cups cake flour, plus more for pans, sifted 1 1⁄ 2 tsp. ground cinnamon 6 egg whites, at room temperature 12 tbsp. unsalted butter, melted 1⁄ 3 cup Dutch-processed cocoa powder, sifted 2 cups whole walnut halves Make the cake: Heat oven to 350°.