How to Make It
Preheat oven to 350°F. Lightly grease a 9x13 baking dish with butter or nonstick spray.
Make the base: Toss cherries, sugar, lime juice, cornstarch, flour, and salt in the baking dish.
Make the cake mix: Combine coconut, flour, sugar, lime zest, baking powder, baking soda, and salt in a medium bowl and sprinkle evenly over the base. Using the largest holes on a box grater, grate the butter evenly over the surface of the cake.
Bake until cake is golden brown and set, 45 to 50 minutes. Cool 30 minutes before serving and top with additional lime zest.