Preheate oven 350 F. Grease pan.

Combine flour, sugar, baking powder and salt in mixing bowl; cut in shortening with pastry blender until mixture resembles coarse crumbs.
Add eggs, orange juice and orange peel; stir just until blended.
Set batter aside.
Combine confectioners' sugar, nuts and cocoa in small bowl; stir in melted butter to form a crumb mixture.
Spread 3/4 cup batter evenly on bottom of pan; sprinkle half the crumb mixture over batter.
Spread with 1 cup batter, sprinkle with remaining crumb mixture, and cover with remaining batter.
Bake for alloted time, or until toothpick inserted in center comes out clean.
Cool slightly; spread with Orange Glaze and serve warm.

Orange Glaze

1 cup confectioners' sugar
2 tablespoons fresh orange juice
1/4 teaspoon orange peel -- grated
Combine ingredients in small bowl; blend until smooth.