Lemonade Party Cake
["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."]
["lemon cake mix", "concentrate lemonade", "sugar"]