Dessert & Treats Recipes Cake Recipes Fillings & Frostings Buttercream Frosting Recipes Meringue Butter Cream 3.7 (6) 6 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 November 16, 2017 Print Rate It Share Share Tweet Pin Email Yield: 10 cups Ingredients 3 cups granulated sugar 12 large egg whites 2 pounds (8 sticks) unsalted butter, softened and cut into tablespoon-size pieces 2 teaspoons pure vanilla extract Directions Whisk sugar and egg whites in a large heatproof bowl set over a pan of simmering water until sugar is dissolved and mixture registers 140 degrees.on an instant-read thermometer, 2 to 3 minutes. Fit an electric mixer with the whisk attachment, and beat the egg-white mixture on high speed until it holds stiff (but not dry) peaks and mixture is fluffy and cooled, about 10 minutes. Reduce speed to medium-low, and add butter several tablespoons at a time, beating well after each addition (meringue will deflate slightly as butter is added). Add vanilla; beat until frosting comes together, 3 to 5 minutes. Beat on lowest speed until air bubbles diminish, about 2 minutes. Stir with a rubber spatula until frosting is smooth. Rate it Print