This heavenly buttercream is far superior in flavor & texture to its American relative. This isn’t the easiest recipe to make, but it is well worth the extra effort. The extra smooth & creamy texture works great for frosting or filling cakes. However, for piping decorations (like roses or basketweave finishes), use an American Buttercream recipe, which will hold up much better.
Ingredients:
1¼ cups egg whites (about 9-10 eggs whites)
3 cups white sugar
2½ cups unsalted butter, cubed, room temperature (5 sticks)
2-4 tablespoons vanilla extract to taste (use the real stuff!)
Gel food coloring (optional)
Directions:
Make sure all your bowls & utensils are completely free of oil, grease or egg yolk before you start . The presence of oils can prevent your egg whites from turning into a stiff meringue. To be extra sure, you may want to wipe down everything with a cloth damped with lemon juice which will remove any oils.
Gently mix together the egg whites & sugar into a glass or metal bowl to incorporate.
Place the bowl over a pan of boiling water. Heat, stirring frequently, until the temperature of the egg whites reaches 140-160 degrees & all of the sugar has dissolved.
<em>Tip: This step pasteurizes the egg whites, and dissolves the sugar, so make sure you don’t take it off the water bath too early. If you don’t have a thermometer, wait until the mixture is very hot to the touch and doesn’t feel grainy between your fingers. You want it as hot as you can get it, while being careful not to cook the eggs.</em>
Transfer the heated egg whites and sugar to a large mixing bowl or stand mixer. Whisk at high speed with a until it forms a stiff meringue, or about 10 minutes. \
Tip: It is important to transfer the mixture into a new bowl before mixing because you will need to cool down the eggs before you can add the butter. If the meringue still feels too warm to the touch after whisking, wrap the bowl in an ice pack, or place in the fridge for a bit before adding the butter.
Once you have a stiff meringue that has cooled down, remove the whisk attachment and replace with a paddle attachment (if you have one). Mix on medium speed while adding the cubes of butter. Mix in vanilla.
Once the butter & vanilla has been added, especially if the meringue was not cooled enough, the buttercream may begin to become soupy, or look curdled. Mix on high speed until the buttercream thickens up into a smooth thick frosting. This can take 10-20 minutes. An ice pack around the bowl can help speed up the process.
To color the buttercream, mix in gel food coloring a little bit at a time until desired color is reached. Remember that the color will darken over about 24 hours.
Tip: Using gel , not liquid, food coloring will ensure that the texture & moisture level of your fondant is not altered when you color your fondant. If you can’t find it at your local grocery store, any baking store, or craft store with a baking section should carry gel food coloring. A toothpick is a good tool to transfer gel food coloring from the jar into your fondant.
The buttercream should be stored in an air tight bowl for up to 48 hours, or in the fridge for up to one week. To use after refrigeration, take 1/4 of the buttercream batch, and microwave it on low heat until it begin to get warm (don’t overheat it or it will melt!). Mix the cold buttercream using an electric mixer, and slowly add in the warmed buttercream until it is all incorporated together.
You may want to refrigerate frosted cakes due to the egg whites in the buttercream.
Chocolate Variation: Reduce the vanilla extract to 1-2 tablespoons. After you complete the recipe above, mix in 4 oz of melted semi sweet chocolate. Make sure the chocolate is as cool as possible while still being liquid, so that it doesn’t melt the buttercream.
Resources:
Video Tutorial | Martha Stewart’s Orange Almond Cake with Swiss Meringue Buttercream