Chocolate Cake Layers:

4 oz semi-sweet chocolate, chopped

¼ cup Dutch-process cocoa powder

½ cup boiling water

2 cups all-purpose flour

¾ tsp baking soda

12 tbsp unsalted butter, softened

1 cup granulated sugar

¾ cup packed light brown sugar

¾ tsp salt

4 large eggs

1 tsp vanilla extract

¾ cup sour cream

Coconut Pecan Frosting:

2 cups heavy cream or evaporated milk

2 cups granulated sugar

6 egg yolks

1 tsp salt

1 cup unsalted butter

2 tsp vanilla extract

2 cups toasted pecans, chopped

4 cups toasted sweetened shredded coconut