Mix sugar, oil and eggs in large bowl; beat for 2 minutes. Blend in apples. Combine dry ingredients; gradually beat into egg mixture. Stir in prunes and nuts. Spoon into a greased and floured tube pan. Bake at 160ºC or 1 hour and 20 minutes or until a toothpick inserted near the center comes out clean. Cool in pan 15 minutes; invert onto wire rack to cool.
Just before serving, dust cake with confectioners' sugar.
Yield 12-14 servings.