Chocolate Coconut Rum Cake

Makes one 7- or 8-inch round cake

1 cup sweetened flaked coconut
4 ounces semisweet chocolate, broken into pieces
5 tablespoons unsalted butter
3 tablespoons light or golden rum
4 large eggs, separated
1/4 cup granulated sugar
2 tablespoons all-purpose flour
1/4 teaspoon salt

Frosting
1/4 cup (1/2 stick) unsalted butter, softened
1 tablespoon light or golden rum
1/4 teaspoon salt
2/3 cup confectioners' sugar

In a baking dish toast 2/3 cup of the coconut in the middle of a preheated 350