Ermine Icing

Directions

1. 1
   Over medium heat, whisk flour and milk in a small saucepan and heat to a simmer, stirring frequently until it becomes very thick and almost puddinglike.
2. 2
   Remove from heat, whisk in vanilla and salt.
3. 3
   Pour into a bowl to allow it to cool completely.
4. 4
   Put plastic wrap on the surface to keep a skin from forming.
5. 5
   Use a mixer to cream together butter and sugar until light and fluffy, scraping the sides of the bowl occasionally, about 5 minutes.
6. 6
   With the mixer on medium, add the cooled flour mixture a little bit at a time.
7. 7
   Continue to beat until the mixture becomes light and fluffy and resembles whipped cream.