To make filling: Combine the diced apples, 1 tablespoon white sugar, and cinnamon. Set filling aside.

Sift together flour, baking powder, and salt. Beat 2 cups white sugar, oil, orange juice, vanilla, and eggs at high speed. Stir in sifted ingredients. Fold in nuts. Pour 1/3 of the batter into a greased bundt or tube pan. Add alternate layers of filling and batter, ending with batter. Bake at 350 degrees for 55 to 60 minutes, or until the top springs back when lightly touched. Remove cake from the pan while hot. Cool the cake, and sprinkle with confectioners' sugar.