1 box lemon cake mix
6 oz. frozen concentrate lemonade
2/3 c. sugar
large Cool Whip

Bake cake as directed in 13 x 9 pan. Let cake cool for 15 minutes. Poke holes in cake with large fork about every 1/2-inch.

Combine thawed lemonade with sugar. Pour mixture over cake. Spread Cool Whip over cake. Refrigerate for 2 hours.