Cointreau Custard Sauce - cooking recipe

Ingredients

2/3 cup sugar
2 tablespoons cornstarch
2 1/2 cups milk
1 orange, grated peel
4 egg yolks
1 teaspoon vanilla
1/3 cup Cointreau liqueur

Preparation

Combine the sugar and cornstarch in a heavy saucepan. Add milk and stir till smooth.
Add orange peel.
Gently heat the mixture until it starts to thicken. Stir constantly for 2 minutes.
Beat egg yolks and slowly add 1/2 cup of the sauce. Slowly add egg mixture to the sauce. Continue to cook for a few minutes, but make sure that the sauce does not boil.
Pour sauce into a bowl and add vanilla and cointreau, stir gently to mix.
Refrigerate till ready to use.