Janet - this would be easy for them to make:
Lemon Bars
1 1/8 cups all-purpose flour
1/3 cup confectioners' sugar
1/2 cup butter, softened
2 eggs
2/3 cup confectioners' sugar
1/3 cup fresh lemon juice
1 1/2 teaspoons grated lemon zest
1/4 teaspoon baking powder
1 tablespoon confectioners' sugar
Metric:
140 g all-purpose flour
40 g confectioners' sugar
115 g butter, softened
2 eggs
85 g confectioners' sugar
80 ml fresh lemon juice
3 g grated lemon zest
0.8 g baking powder
7 g confectioners' sugar
Preheat the oven to 325 degrees F (165 degrees C).
In a medium bowl, mix together the flour, 1/3 cup of confectioners' sugar, and butter until butter is in very small crumbs. Press into the bottom of a 9x13 inch pan(rectangular cake pan).
Bake for approximately 25 minutes in the preheated oven, or until firm and lightly browned.
While the crust is baking, whisk together the eggs, 2/3 cup of confectioners' sugar, lemon juice and lemon zest in a medium bowl. Just before the crust is done, stir in the baking powder. Pour over the crust while it is hot, and return to the oven.
Bake for approximately another 25 minutes in the preheated oven, until set. Dust with remaining confectioners' sugar when cool.