Step 1

Prepare cake mix and bake according to package directions in a 9x13 pan.

Step 2

Blend strawberries in a blender or food processor until smooth.

Step 3

Add pureed strawberries, sugar, vanilla and lemon juice to a small sauce pan over medium high heat.

Step 4

Heat until sugar is dissolved and strawberry sauce is thickened a bit, for about 5 minutes. Set aside.

Step 5

When cake is done cooking, allow to cool for about 5 minutes.

Step 6

Poke cake all over with a wooden spoon or fork.

Step 7

Pour strawberry sauce over the top of the cake and spread evenly to fill all the holes.

Step 8

Cover cake and allow to cool in fridge for about an hour.

Step 9

Top cake with cool whip and spread evenly.

Step 10

Place cake back in the fridge for another 4 hours, up to overnight.

Step 11

Slice and serve.