Step 1

Preheat oven to 350 degrees F. Coat 2 (9-inch) round cake pans with cooking spray; set aside.

Step 2

In a large bowl with an electric mixer, beat cake mix, gelatin mix, strawberries, eggs, oil, and water, 2 to 3 minutes or until well mixed. Divide batter evenly between cake pans.

Step 3

Bake 20 to 25 minutes or until a wooden toothpick inserted in center comes out clean. Let cool 10 minutes, then invert onto wire racks to cool completely.

Step 4

To make frosting, in a medium bowl, with an electric mixer, beat butter until creamy. Slowly beat in 2 cups sugar at a time, alternating with lemon juice until smooth and creamy. Stir in lemon zest.

Step 5

Place one cake layer upside down on a serving plate and frost the top. Place the second layer over the first and frost the top and sides. Serve or refrigerate until ready to serve.