Whenever I serve this cake, I never tell them the surprise ingredient until after they've tasted it. Then, it's just fun to see the look on their faces when I reveal the secret. No one ever guesses that there's a can of tomato soup in this beautiful, delicate, and delicious spice cake. My mom always frosted it with a Chocolate Frosting, so that's the way I make mine. But, I've seen it with a Vanilla Glaze or with a Cream Cheese Frosting too. I'll let you choose which one is your favorite. As for me and my family...it's chocolate frosting, all the way!