Combine sugar, cornstarch and salt. Stir in milk. Cook and stir until thickened
and bubbly. Stir a small amount into the egg yolk; return all to saucepan. Cook
and stir for 2 minutes or until thickened.
Remove from heat; stir in vanilla extract.
Pour into a serving bowl. Cover the surface with plastic wrap and cool; then chill.
Remove plastic and garnish with berries before serving.