Mysterious Orange Cake

I clipped this recipe out of Redbook magazine. It is a tomato soup cake, but with an interesting twist. Can you guess the mystery ingredient?

• Ready In: 45 mins
• Serves: 8

Ingredients

• 1⁄2 cup butter or 1⁄2 cup margarine, softened
• 1 1⁄3 cups granulated sugar
• 2  large eggs
• 1 (10 3/4ounce) can  condensed tomato soup
• 1⁄4 cup water
• 4  teaspoons baking powder
• 1  teaspoon baking soda
• 1  teaspoon ground cinnamon
• 1⁄2 teaspoon  freshly grated nutmeg
• 1⁄2 teaspoon ground ginger
• 1⁄4 cup orange marmalade (the mystery is solved!)
• 1  cup confectioners' sugar

Directions

1. Heat oven to 350 degrees.
2. Grease and flour two 9-inch round cake pans.
3. In large bowl with electric mixer at medium speed, beat butter, sugar, eggs, tomato soup, water, flour, baking powder, baking soda, cinnamon, nutmeg and ginger about 3 minutes until well blended, stopping mixer to scrape down sides of bowl occasionally.
4. Pour batter into prepared pans,.
5. Bake 25 to 30 minutes until wooden toothpick inserted in center comes out clean.
6. Cool layers in pans on wire racks 10 minutes.
7. Remove from pans to racks to cool completely.
8. TO SERVE:
9. Place one cooled cake layer on serving platter; spread with the mystery ingredient (orange marmalade).
10. Place remaining layer on top.
11. In small bowl stir 2 tablespoons water into confectioners sugar until smooth.
12. Using small spoon, drizzle glaze in decorative pattern over top of cake.