Key Lime Pie Poke Cake

Preparation

1.  In a medium pan, combine pudding mix, rice milk, lime juice, lime zest and food coloring. Cook and stir over medium heat until thickened. Refrigerate to chill.
2. Heat oven to 350° F (325° F for dark or nonstick pan). Spray bottom only of a 9" x 13" baking pan with baking flour.
3. In a large bowl, beat cake mix, water, egg whites and oil with an electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Pour into pan.
4. Bake for 25 to 35 minutes or until toothpick inserted in center comes out clean. Cool 5 minutes. With handle of wooden spoon (1/4" to 1/2" diameter), poke holes almost to bottom of cake every 1/2 inch, wiping spoon handle occasionally to reduce sticking.
5. Remove pudding mixture from refrigerator and set aside 1-1/2 cups to add to icing. Pour remaining filling mixture over cake. Spread over cake surface, working back and forth to fill holes. Some filling should remain on the top of the cake. Refrigerate for one hour.
6. Mix frosting and reserved filling in a bowl and whip together. Frost cake and garnish with lime zest.