Step 1

Preheat oven to 350 degrees and spray a 9x13-inch pan with cooking spray.

Step 2

Using an electric mixer, beat cake mix, pudding mix, eggs, and vegetable oil until well mixed.

Step 3

Beat in 7-Up until batter has an even consistency. Pour batter into prepared pan.

Step 4

Bake for 30 to 35 minutes or until cake feels firm when you press on the top.

Step 5

Prepare the frosting while the cake is baking. In a medium saucepan, whisk together the sugar and flour.

Step 6

Add the eggs, butter, and pineapple and cook over medium-low heat, stirring constantly, until mixture thickens up.

Step 7

Remove from heat and stir in the coconut. Pour over cake.