(Coconut) Vanilla Buttercream Frosting

Frosting:
1 cup sugar
1/4 cup water
5 large egg whites
1/2 teaspoon cream of tartar
1/8 teaspoon salt
1/4 cup butter, softened
1/4 teaspoon coconut extract (optional)
3 tablespoons toasted flaked sweetened coconut

To prepare frosting, combine 1 cup sugar and 1/4 cup water in a saucepan; bring to a boil. Cook 3 minutes, without stirring, or until a candy thermometer registers 250°. Combine egg whites, cream of tartar, and 1/8 teaspoon salt in a large bowl; using clean, dry beaters, beat with a mixer at high speed until foamy. Pour hot sugar syrup in a thin stream over egg whites, beating at high speed until stiff peaks form, about 3 minutes. Reduce mixer speed to low; continue beating until egg white mixture cools (about 12 minutes).

Beat 1/4 cup butter until light and fluffy; stir in 1/4 teaspoon extract, if desired. Fold in 1 cup egg white mixture. Fold butter mixture into remaining egg white mixture, stirring until smooth.

Place 1 cake layer on a plate; spread with 1 cup frosting. Repeat twice with cake layers and 1 cup frosting, ending with cake layer; spread remaining frosting over top and sides of cake. Sprinkle with toasted coconut. Chill until set.

From Cooking Light website.