Lemon Sauce

Directions

1. 1
   Mix the sugar and cornstarch.
2. 2
   Add boiling water and salt; boil until thick and clear, stirring constantly.
3. 3
   Beat in the butter and lemon juice.
4. 4
   After separating the egg, beat yolk with a fork.
5. 5
   Add some of the hot mixture.
6. 6
   Add the yolk to the hot mixture and cook for 5 minutes.
7. 7
   Beat the egg white until soft peaks form, then slowly fold into the hot sauce.
8. 8
   Serve warm over plain cake or cupcakes.