Beat egg whites and sugar on a double boiler on a low speed till the sugar dissolves

Remove off heat and beat on high heat till it becomes smooth and glossy and doubles in volume. To help it cool faster you can put the bowl on an ice bath.

Put whisk on a slow speed and slowly start adding softened butter its important the butter be soft. Keep adding till the butter is fully incorporated.

Now turn the whisk on full speed and keep beating it till it all comes together. There will be a moment when it just magically comes together wait for it. Once again if you want to hasten the process put the bowl on an ice bath.

The buttercream cream is ready you can add any flavor or colour to it and pipe it out. It holds beautifully and tastes smooth and luxurious.