This is a lovely orange cake for when company calls.
1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9×13 inch pan, two 9 inch round cake pans, or three 8 inch round cake pans.
2 In a large bowl, combine cake flour, sugar, baking soda and salt. Mix in butter, shortening, buttermilk, eggs, raisins, nuts, orange zest and vanilla. Beat with an electric mixer for 3 minutes on high speed. Pour batter into prepared pan.
3 Bake in preheated oven until a toothpick inserted in center of cake comes out clean. Bake 9×13 inch pan 45 to 50 minutes, or layers 30 to 35 minutes. Allow to cool, and frost with Williamsburg Butter Frosting.