-
Mix sugar and the cornstarch in saucepan
-
Stir in water
-
Cook over medium heat, stirring constantly, until mixture thickens and boils
-
Boil and stir 1 minute
-
Whisk half of hot mixture into egg yolks
-
Add back into remaining hot mixture in saucepan
-
Return to boiling and stir constantly 2 minutes
-
Remove from heat
-
Stir in butter, lemon zest and lemon juice Cover and keep warm