Heat oven to 350°. Grease or lightly spray bottom of 13X9-inch pan or Bundt pan.
Add enough water to drink mix to measure 1 ¼ cups.
In a large bowl, beat cake mix, drink mix, egg and oil with electric mixer on low speed for 2 minutes.
Pour into pan. Bake and cool as directed on the box.
Stir lime peel into whipped topping, spread over top of cake.
Garnish with berries. Store in the refrigerator.
1 cup strawberry nonalcoholic margarita mix
1 T cornstarch mixed with 2 T cold water
Heat drink mix in a small pan, add cornstarch slurry and cook until thickened.
This is a slightly tart glaze. If desired, you can add some powdered sugar to sweeten it.
Cool and pour over cake