- Cake 
- Preheat oven to 350F (175C). Grease and flour a 9-inch round cake pan. 
- In a medium bowl, whisk together cake flour, baking powder, baking soda, and salt. 
- In a large bowl, cream together butter and sugar until light and fluffy. Beat in eggs one at a time, then stir in vanilla extract. 
- In a small bowl, whisk together coconut milk and shredded coconut. 
- Gradually add dry ingredients to the wet ingredients, alternating with the coconut milk mixture, beginning and ending with the dry ingredients. Mix until just combined. Do not overmix. 
- Pour batter into prepared pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. 
- Let cool in pan for 10 minutes before inverting onto a wire rack to cool completely. 
- Frosting 
- In a large bowl, cream together butter and confectioners' sugar until light and fluffy. 
- Gradually add coconut milk, vanilla extract, and salt, beating until smooth and creamy. 
- Assembly 
- Once the cake is completely cool, frost the top and sides with the coconut buttercream frosting. 
- Sprinkle with additional shredded coconut. 
- Slice and serve. 
- Optional Tips: For a more intense coconut flavor, toast the shredded coconut before adding it to the batter and for topping. To toast, spread coconut in a single layer on a baking sheet and bake at 350F (175C) for 5-7 minutes, or until lightly golden. Watch carefully, as it burns easily. If cake flour is unavailable, all-purpose flour can be used, but the cake will be slightly denser. Reduce the all-purpose flour by 2 tablespoons per cup. To prevent the cake from sticking, line the bottom of the pan with parchment paper before greasing and flouring.