Another meringue based buttercream Be The First To Review By ombaker recipe Add To Favorites Print 107 Views 1 Comments 129 Favorites This was the buttercream recipe I got in culinary school. It’s not too sweet and very esy to work with. Another meringue based buttercream Ingredients 7oz egg whites1/2 t cream of tarter14oz powdered sugar3T corn starch1 lb slightly softened butter1 1/4oz shortening Instructions Combine first four ingredients in a metal bowl and heat over boiling water. Whisk constantly till mixture reaches 160 degrees. Pour into mixer bowl and beat on high till stiff peaks form Turn speed to low and mix till bottom of mixer bowl is cool to the touch. Can be as long as 10 minutes Turn mixer to med-high Slowly add diced butter. Mix till each addition is incorporated. Add shortening and beat on high till light and fluffy. This just takes a minute or two. I don’t generally add vanilla or any flavoring to this but you can if you like.