Swiss Meringue Buttercream
Swiss Meringue Buttercream is stiffer than regular buttercream, but is susceptible to the same melting in higher temps.
This recipe makes roughly enough for 1 regular sized sponge cake
Ingredients
180g Egg Whites
400g Sugar
340g Unsalted butter
2 Teaspoons vanilla extract (or more, depending on your tastes)
1/8th teaspoon salt
Method
Add eggs and sugar to a steel / copper bowl
Place bown over a sauepan of boiling water, bain marie style - only allow steam to touch the bowl, not the water
Whisk the egg whites until they reach 71°C - Just keep them constantly moving
Remove from heat, and pour into the mixer
Whisk until meringue-ey (holds stiff peaks)
Continue whisking and add butter in 1 thumb sized knob at a time until full incorporated.
ps. This may take some time, but just keep whisking like crazy until it forms a stuff buttery consistency.