1 (9 inch) graham cracker crumb crust or baked pastry shell
3 egg yolks
1 (14 oz.) can sweetened condensed milk
1/2 c. lemon juice
1 1/2 tsp. grated lemon rind, optional
Yellow food coloring, optional
1 (21 oz.) can blueberry filling and topping, chilled
Whipped topping or whipped cream

Preheat oven to 350 degrees. In medium bowl, beat egg yolks, stir in sweetened condensed milk, lemon juice, lemon rind and food coloring if desired. Pour into prepared crust, bake 8 minutes. Cool, chill, top with blueberry filling. Garnish with whipped topping.