Old-Fashioned Chocolate Pie

Directions

1. 1
   Combine 1 1/4 cups sugar, cocoa, cornstarch and salt in heavy saucepan.
2. 2
   Whisk to remove lumps.
3. 3
   Gradually whisk in milk.
4. 4
   Cook over medium heat, stirring constantly, until thickened and comes to a boil.
5. 5
   Boil 1 minute.
6. 6
   Remove from heat.
7. 7
   Beat the egg yolks until thick.
8. 8
   Stir 1/4 of the hot mixture into the yolks.
9. 9
   Add remaining yolks to hot mixture.
10. 10
    Cook over medium heat for 2 minutes.
11. 11
    Remove from heat and stir in the butter and vanilla.