How to Make Perfect Italian Meringue Buttercream: Step-by-Step
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Recipe Type: Dessert, Frosting, Tips
Serves: 700g or enough for 24 cupcakes or 1, double tier layer cake
 
Here are all the tips you need to make smooth, creamy Italian Meringue Buttercream, perfect for flawless cake frosting.
Ingredients
  • 2 cups sugar (375g), divided
  • ⅔ cup water (150g)
  • 5 large egg whites (150g)
  • pinch salt, optional
  • pinch cream of tartar, optional
  • 2 cups butter, cubed (4 sticks or 1 pound), cool but not cold
  • 2 teaspoons vanilla extract
For the Chocolate Variation:
  • 1¼ cup semi-sweet chocolate, melted but not hot
Instructions
  1. You want to make sure that you have everything measured out and ready to go. This recipe is simple but it does require seamless execution. You also want to make sure that your mixing bowl is clean and free of any residual fat, or your meringue will not whip up and there will be sadness abound.
  2. Mix half of the sugar with the water in a medium saucepan over medium heat, stir just until the sugar dissolves. When the pan heats up, brush around the sides of the pot with a clean pastry brush dipped in water to dissolve any sugar crystals adhered to the sides of the pot. You can also use a paper towel that you roll up (I did because I forgot my brush at school.)
  3. When your sugar starts to bubble begin whipping your egg whites in the bowl of a stand mixer fitted with the whisk attachment. You can add a pinch of salt and/or cream of tartar for stability if you wish. I only used salt in the photos you see. When your eggs begin to look frothy, slowly begin adding your sugar, whipping constantly on medium-high.
  4. Continue whipping your egg whites until they form stiff peaks. Ideally your meringue should reach stiff peaks at the same time that your sugar syrup reaches 235?F. If your egg whites are whipping too fast, reduce the mixer speed to medium. You can also adjust the heat on the sugar syrup to make it cook faster or slower.
  5. To test your syrup you can either use a candy thermometer or you can do it the old-fashioned way, which is what I did here. Take a tiny bit of the syrup on a spoon and dip it into ice water, reach in and grab the sugar. If it dissolves, it isn’t close to ready; if it forms a little malleable ball, it’s ready!!
  6. Turn your mixer up to high and SLOWLY pour the sugar syrup down the side of the bowl. Be very careful not to hit the whisk. Ideally you should pour it in one solid stream down the edge because it will solidify where it hits the bowl, so if you pour it in three different places, you will be losing sugar. Sadness.
  7. Keep whipping the Italian meringue on high until it forms stiff, but what is more important than the stiffness of the meringue is the temperature of the meringue. Before you begin adding the butter, the bottom of the bowl should feel barely warm.
  8. When the bowl feels just slightly warm, switch to the paddle attachment and begin adding your butter a piece at a time. I take my butter out of the fridge when I begin measuring my ingredients. Before adding each piece squeeze the butter.
  9. Continue to beat the butter in on medium-high until the buttercream is smooth and there are no remaining pieces of butter. At this stage I switch back to the whisk, add my flavorings and beat it until it is light and fluffy. Pipe or spread as desired!!
For the Chocolate Variation:
  1. When your butter has been completely incorporated, pour your chocolate in all at once and immediately fold it in with a spatula or beat it in with the paddle attachment. You want to make sure that your chocolate is melted but not hot and it is also still warm enough to flow freely in a continuous stream. If your chocolate is too hot, you will melt your butter cream; but if it is too cool, then you will have pieces of chocolate in your frosting.
Recipe by Honest Cooking at https://honestcooking.com/make-perfect-italian-meringue-buttercream-step-step/