Heat
oven to 350°F (325°F for dark or nonstick pan). Spray bottom only of
13x9-inch pan with baking spray with flour. In small bowl, mix hot water
and gelatin until gelatin is completely dissolved; cool slightly.
In
large bowl, beat cake mix, 1/4 cup of the gelatin mixture, 1/4 cup of
the lemonade concentrate, the water, oil and egg whites with electric
mixer on low speed 30 seconds, then on medium speed 2 minutes. Pour into
pan. Reserve remaining gelatin mixture and lemonade concentrate.
Bake
25 to 31 minutes or until toothpick inserted in center comes out clean.
Poke warm cake every inch with fork tines. Remove 1 tablespoon of the
reserved gelatin mixture to microwavable custard cup or small bowl. In
another small bowl, mix remaining gelatin mixture and remaining 1/4 cup
lemonade concentrate; pour slowly over cake. Cool completely, about 1
hour.
In
medium bowl, fold together frosting and whipped topping; frost cake.
Microwave 1 tablespoon gelatin mixture uncovered on High 10 seconds to
liquefy. Using 1/4 teaspoon measuring spoon, place small drops of
gelatin mixture over frosting; with spoon or toothpick, swirl gelatin
into frosting. Garnish each piece with raspberries and lemon peel
strips. Store covered in refrigerator.
