Grease a 10-inch cake pan and set aside. To the bowl of a mixer fitted with a whip attachment, add all the ingredients and mix until just combined. Scrape down the sides of the bowl with a rubber spatula to ensure even mixing. Slowly increase the speed to the highest setting and whip for 10 minutes. The cake batter will double in volume. Pour batter into the prepared pan. Bake for 35 to 40 minutes, until firm when touched, or when a toothpick that has been inserted into the center comes out clean.
Turn the cake onto a cooling rack and let it rest in the pan until cool enough to remove. Run a pairing knife around the edge to loosen the cake and then invert it onto the rack. When completely cool, slice the cake in half. Frost the bottom layer and then position the second layer directly on top. Frost the top of the cake and the sides until cake is completely covered.
Swiss Meringue Buttercream:
In a stainless steel bowl, whisk together the egg whites and sugar until combined. Place the bowl with the egg white mixture over a pan of simmering water, creating a double boiler. Be careful that the bowl does not touch the water. Heat the egg white mixture until it is very warm to the touch.
Pour mixture into the bowl of an electric mixer fitted with a whip attachment and whip on the highest setting until the mixture is thick and fluffy, about 10 to 15 minutes. Once the mixture has reached full volume, reduce the speed to medium; add all of the shortening and then add the butter, 1 chunk at a time. Return the mixer to the highest setting and continue to whip until all the butter and shortening are incorporated and the mixture is smooth and creamy. Transfer to a plastic container until ready to use.
Fluid flex is available in specialty/gourmet food stores.
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This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of Christian Balbierer, Bluepointe, (C) 2003
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