Drain the pineapple and save the juice.

In the cake mix recipe, substitute the water for the pineapple juice.

Prepare the cake according to the instructions on the box.

Beat in the half of the pineapple bits at the end. Save the rest for another time.

Allow the cake to cool.

Using an electric mixer with a whisk attachment, whip the white frosting.

Frost the cake.

Decorate with toasted coconut.