1 box lemon cake mix
1 c. lemon juice
2 cans condensed milk
1 container Cool Whip

Mix and bake lemon cake according to instructions. Using a wooden spoon handle, poke holes in cake. Mix one can of condensed milk with the lemon juice. Mix with a mixer. Using half of the mix, add the other can of condensed milk with the carton of Cool Whip. Pour over cake. Refrigerate until ready to use.