Italian Meringue Buttercream Frosting (Print version)

Silky, stable buttercream with delicate sweetness, perfect for frosting cakes and cupcakes beautifully.

# Ingredient List:

→ Sugar Syrup

01 - 1 cup granulated sugar
02 - 1/4 cup water

→ Egg Whites

03 - 4 large egg whites (about 1/2 cup), at room temperature
04 - 1/4 teaspoon cream of tartar (optional, for stability)
05 - 1/4 teaspoon salt

→ Butter

06 - 1 1/2 cups (3 sticks) unsalted butter, at room temperature, cut into cubes

→ Flavoring

07 - 1 to 2 teaspoons pure vanilla extract

# How To Make It:

01 - Combine granulated sugar and water in a small saucepan. Stir gently to moisten the sugar, then heat over medium heat without stirring until the syrup registers 240°F on a candy thermometer.
02 - While the syrup heats, place egg whites and cream of tartar in the bowl of a stand mixer fitted with the whisk attachment. Beat on medium speed until foamy, then add the salt.
03 - Once the syrup reaches 240°F, remove it from heat immediately. With the mixer running on medium-high speed, pour the hot syrup into the egg whites in a thin, steady stream, directing the pour along the side of the bowl to avoid splashing the whisk.
04 - Increase the mixer speed to high and continue whipping until the meringue holds stiff, glossy peaks and the mixing bowl feels cool to the touch, approximately 10 minutes.
05 - Switch to the paddle attachment. With the mixer on medium speed, add the cubed butter one piece at a time, allowing each addition to fully blend before adding the next. If the mixture appears curdled at any point, keep mixing — it will come together smoothly.
06 - Pour in the vanilla extract and continue beating until the buttercream is silky and uniform. If the frosting feels too soft, refrigerate briefly, then re-whip to the desired consistency.
07 - Use the buttercream immediately to frost cakes or cupcakes. Alternatively, transfer to an airtight container and refrigerate for up to 1 week or freeze for up to 2 months. Bring to room temperature and re-whip before using stored buttercream.

# Expert Advice:

01 -
  • The texture is impossibly silky and pipes like a dream, making even a simple layered cake look professional.
  • It is far less sweet than American buttercream, so the flavor of your cake actually shines through.
  • Once you master the technique, it is incredibly stable at room temperature and holds up beautifully for hours.
02 -
  • The number one reason this buttercream fails is butter that is too cold or too warm, so aim for that perfect room temperature softness where it bends but is not melted.
  • If your buttercream looks broken or curdled after all the butter is in, do not throw it away, just keep beating and it will almost always emulsify back together within a few minutes.
03 -
  • Clean your mixer bowl and whisk with a splash of vinegar or lemon juice before starting, because even a tiny trace of fat from a previous recipe can prevent egg whites from reaching full volume.
  • Cut your butter into small, uniform cubes before you begin so you can add them quickly and evenly without stopping to cut more mid-process.

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