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To make coconut buttercream for the filling, beat in 1 cup shredded unsweetened coconut with the vanilla in step 3. If your mixer bowl is large enough, you can double this recipe. This recipe comes from Martha Stewart M-m-m good!!
- Put sugar and egg whites in the heatproof bowl of an electric mixer, and set over a pan of simmering water. Whisk constantly until sugar is dissolved, and mixture registers 140F on an instant-read thermometer.
- Transfer bowl to an electric mixer fitted with the whisk attachment. Beat on medium-high speed until fluffy and cooled, about 10 minutes. Continue beating until stiff, glossy peaks form.
- Reduce speed to medium-low; add butter by the tablespoon, beating well after each addition. Beat in vanilla and coconut if making buttercream for filling. Buttercream can be refrigerated in an airtight container up to 3 days or frozen up to 1 month. Bring to room temperature before using; beat on lowest speed until smooth, about 3 minutes.