Cooking : Blueberry-Topped Custard

Ingredients
1/2 cup sugar
2 tablespoons all-purpose flour
1/8 teaspoon salt
1 1/2 cups half-and-half cream
1 teaspoon grated lemon peel
3 egg yolks, lightly beaten
2 tablespoons butter or margarine
1 tablespoon vanilla extract
1 (15 ounce) can blueberries
1 tablespoon cornstarch

Directions
In a saucepan, combine the sugar, flour and salt. Gradually add cream and lemon peel until blended. Bring to a boil; cook and stir for 2 minutes or until thickened and bubbly. Remove from the heat. Stir a small amount of hot mixture into egg yolks. Return all to pan; bring to a gentle boil, stirring constantly. Remove from the heat; stir in butter and vanilla. Pour into four parfait glasses or dessert dishes. Cool. Drain blueberries, reserving juice. Spoon blueberries over custard. In a saucepan, combine cornstarch and blueberry juice until smooth. Bring to a boil over medium heat; cook and stir for 1-2 minutes or until thickened. Spoon over berries.