Lemon Icebox (Or Freezer) Cake - cooking recipe

Ingredients

1 lemon (peel grated & juice strained)
1 1/2 oranges (peel grated & juice strained)
1 cup butter
1 cup sugar
3 eggs (separated)
15 ladyfingers (or 1 already cooked pound cake, cut in fingers)

Preparation

Cream butter & sugar together.
Add egg yolks, grated lemon peel, grated orange peel + the strained juices & mix well.
Beat the egg whites till stiff & fold them into the butter mixture.
Line the bottom of a 1-qt mold or cake tin w/ladyfingers (or pound cake fingers) & cover them w/a layer of the butter mixture.
Repeat for as many layers as you can, ending w/ladyfingers or pound cake on top.
Refrigerate overnite or freeze for at least 2 hours & then unmold to serve.
Idea Option: Sub lime for the lemon? Yum!