1/2 c sugar                                                   1/4 c cornstarch

1/2 tsp salt                                                   4 c milk

4 egg yolks, slightly beaten                   2 T butter

2 tsp vanilla

In a small saucepan, combine the sugar, cornstarch, and salt.  Gradually stir in milk.  Cook and stir over medium heat until thickend and bubbly. Reduce heat; cook and stir 2 minutes longer.  Remove from heat.

Stir 1/2 of hot milk mixture into egg yolk, stirring constantly.  Return all to the milk mixture pan, stirring constantly.  Bring to a gentle boil and stir 1 minute longer.  Remove from heat and stir in butter and vanilla.

Cool for 15 minutes, stirring occasionally.  Transfer to dessert dishes or custard cups.  Cover and refrigerate.