How to Make Old-Fashioned Seven-Minute Frosting

Step 1: In a heatproof medium bowl, combine sugar, cold water, egg whites, cream of tartar, and salt.
Step 2: Bring a pot of water to a gentle simmer. Beat the mixture on low speed for 30 seconds.
Step 3: Place the bowl over the simmering water (without letting it touch). Beat on high speed for about 7 minutes, until the frosting is glossy, stiff, and billowy.
Step 4: Remove from heat, add vanilla extract, and continue beating for 1–2 more minutes until firm peaks form and the frosting is perfectly spreadable.
Step 5: Use immediately — this beautiful, glossy finish sets quickly, creating a smooth, marshmallow-like topping that will make any dessert shine.