Dessert & Treats Recipes Cake Recipes Fillings & Frostings Buttercream Frosting Recipes Passion Fruit Swiss Meringue Buttercream 2.8 (42) 4 Reviews By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on September 7, 2017 Print Rate It Share Share Tweet Pin Email Yield: 8 cups Ingredients 8 large egg whites 2 ½ cups sugar 3 cups (6 sticks) unsalted butter, room temperature, cut into tablespoons 1 teaspoon pure vanilla extract Passion Fruit Curd(2 recipes) Directions In the heatproof bowl of an electric mixer set over (but not touching) simmering water, combine egg whites and sugar. Cook, whisking constantly, until sugar has dissolved and mixture is warm to the touch (about 160 degrees). In the heatproof bowl of an electric mixer set over (but not touching) simmering water, combine the egg whites and sugar. Cook whisking constantly until sugar has dissolved and the mixture is warm to the touch (about 160 degrees). Switch to the paddle attachment. With mixer on medium-low speed, add butter, several tablespoons at a time, beating well after each addition. (If frosting appears to separate after all the butter has been added, beat on medium-high speed until smooth again, 3 to 5 minutes more.) Beat in vanilla. Beat on lowest speed to eliminate any air bubbles, about 2 minutes. Using a rubber spatula, gently fold in passion fruit curd until smooth. Rate it Print