This frosting is light, fluffy, and perfect for topping your favorite cakes or cupcakes.
Combine the sugar, water, and cream of tartar in a saucepan.
Stir the mixture gently to ensure the sugar dissolves evenly.
Heat the mixture over medium heat until it reaches 240°F (soft-ball stage).
Use a candy thermometer to monitor the temperature accurately.
Whip the egg whites and vanilla extract in a mixing bowl until soft peaks form.
Ensure the mixing bowl is clean and free of grease for the best results.
Slowly drizzle the hot sugar syrup into the whipped egg whites while continuing to whip at medium-high speed.
Pour the syrup in a thin stream to avoid cooking the egg whites.
Continue whipping until the mixture forms stiff peaks and is glossy.
The frosting is ready when it holds its shape and has a shiny appearance.
Use the frosting immediately to decorate your cakes or cupcakes.
Apply the frosting with a spatula or piping bag for a professional look.