Cooked Salad Dressing

Directions

1. 1
   Mix sugar, flour, salt and mustard in saucepan.
2. 2
   Gradually blend in milk and vinegar.
3. 3
   Cook over low heat, stirring constantly until mixture thickens and boils 1 minute.
4. 4
   Stir at least half of hot mixture slowly into egg yolks.
5. 5
   Stir this mixture into remaining hot mixture in saucepan.
6. 6
   Bring to a boil, stirring constantly.
7. 7
   Boil 1 minute.
8. 8
   Remove from heat and stir in butter.
9. 9
   Cool.