Start a pot of water for your double boiler by placing about one inch of water in a saucepan. Bring water to a simmer (lightly bubbling). Combine Egg Whites and Sugar in a metal bowl. Place metal bowl with egg white on top of your double boiler pot with simmering water. Stir egg white mixture frequently, every minute. NOTE: Be careful while stirring, the egg white bowl can easily shift atop the double and spill; Also, the steam escaping bowl can be very hot. Cook egg white mixture until mixture reaches 160F. At this point all the granulation of the sugar should be dissolved into the warm eggs.
Once egg whites reach temperature, pout the egg mixture into the bowl of a standard Kitchen Aid mixer. Place bowl on mixer with whip attached. Start mixing on medium speed for 10-15 seconds then bring mixer to highest speed available. Stop a scrape every 2-3 minutes. This step may take 5-10 minutes. Mix until egg white mixture forms a thick meringue and side of bowl feels near room temperature.
Once meringue is formed, start adding small 1-2 Tablespoon sized portions of butter then shortening. Pause as needed so the butter and shortening can incorporate into the meringue. Scrape bowl and mix until near firm.
Add pinch of salt and vanilla. Mix, then scrape, then mix some more. Continue to mix until firm buttercream is formed.
For best results, let buttercream set up at room temperature for 2-3 hours (or overnight) before using.
Leftover buttercream can be stored in the refrigerator for one week.
American Style Sweet Buttercream
1.5 lbs. Powdered Sugar (sifted)
1 lb. Butter
½ lb. Shortening
3 teaspoons Vanilla
Combine Butter and Shortening in the bowl standard Kitchen Aid Mixer.
Using paddle attachment cream butter and shortening until smooth. Start using medium speed, scrape, then use high speed. Scrape again and cream until smooth (no lumps if possible)
Turn mixer to its lowest speed and very slowly add powdered sugar. Pausing after each addition until sugar is absorbed into butter mix. Scrape as necessary.
Just before final addition of powdered sugar, add vanilla and remaining powdered sugar. Continue to mix
Scrape again, mix on medium speed now until all ingredients are incorporated. Scrape again if necessary and finish by beating buttercream on high until thick and fluffy.
How do I make buttercream? watch this video>>>
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Food Safety Warning: Please see www.foodsafety.gov for up to date food safety warnings regarding the consumption of pasteurized eggs.