Italian Meringue Buttercream (Printable version)

Silky, stable buttercream made from whipped Italian meringue and butter for cakes and cupcakes.

# What you need:

→ Italian Meringue

01 - 1 cup granulated sugar
02 - 1/4 cup water
03 - 3 large egg whites, room temperature (about 3.5 oz)
04 - 1/4 tsp cream of tartar (optional, for stability)

→ Buttercream Base

05 - 1 1/2 cups unsalted butter, room temperature, cubed (about 12 oz)
06 - 1 tsp vanilla extract
07 - Pinch of fine sea salt

# How To:

01 - In a medium saucepan, combine the granulated sugar and water. Heat over medium heat, stirring gently until the sugar has fully dissolved and the mixture is clear.
02 - Increase the heat to medium-high and cook without stirring until the syrup reaches 244°F on a candy thermometer. Monitor closely to avoid overshooting the target temperature.
03 - While the syrup heats, place the egg whites and cream of tartar (if using) in the bowl of a stand mixer fitted with the whisk attachment. Beat on medium speed until soft peaks form.
04 - Once the syrup reaches 244°F, reduce the mixer to medium speed. Carefully and slowly drizzle the hot syrup down the side of the bowl into the whipping egg whites, avoiding the whisk.
05 - Increase the mixer speed to high and continue whipping until the meringue is thick, glossy, and the bowl feels cool to the touch, approximately 10 minutes.
06 - With the mixer running on medium speed, add the cubed butter one piece at a time, allowing each addition to fully incorporate before adding the next. If the mixture appears curdled or separated, keep beating — it will emulsify and come together smoothly.
07 - Add the vanilla extract and a pinch of fine sea salt. Beat until the buttercream is silky, creamy, and uniformly fluffy.
08 - Use the buttercream immediately for frosting. Alternatively, transfer to an airtight container and refrigerate. Before reusing, bring to room temperature and rewhip until smooth.

# Expert Advice:

01 -
  • Once you nail the technique, this buttercream tastes like something from a professional bakery, miles ahead of any powdered sugar frosting.
  • It pipes beautifully, holds up in warm weather, and freezes for months without losing its velvet texture.
02 -
  • If your buttercream looks soupy or curdled halfway through adding butter, do not throw it out, just keep beating because the emulsion will snap together suddenly.
  • Temperature is everything here, and if the meringue is still warm when the butter goes in, the whole thing will melt into a puddle that requires chilling and rewhipping to save.
03 -
  • Separate your eggs while they are cold because the yolks are firmer and less likely to break, then let the whites sit out until they reach room temperature before whipping.
  • Use a spotlessly clean and grease free bowl for the egg whites, since even a trace of fat or yolk will prevent them from reaching full volume.

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