Instructions

1. Combine first four ingredients in a metal bowl and heat over boiling water. Whisk constantly till mixture reaches 160 degrees.
2. Pour into mixer bowl and beat on high till stiff peaks form
3. Turn speed to low and mix till bottom of mixer bowl is cool to the touch. Can be as long as 10 minutes
4. Turn mixer to med-high
5. Slowly add diced butter. Mix till each addition is incorporated.
6. Add shortening and beat on high till light and fluffy. This just takes a minute or two.
7. I don’t generally add vanilla or any flavoring to this but you can if you like.