In a sauce pan, mix the following:
1/2 cup sugar
3 Tablespoons corn starch
1 teaspoon salt (not Tablespoon--and better make it a skinny teaspoon)
Add:
3 egg yolks
3 cups milk
Cook over medium heat until mixture comes to a boil, stirring constantly. Once mixture starts to boil, remove from heat and add:
1 teaspoon vanilla
1/3 cube butter
1 Tablespoon Cocoa
Pour into cooled, baked crust. Serve with whipped cream.