Preheat oven to 350 degrees F (175 degrees C). Grease a 9 inch pie dish.
In a medium bowl, mix together the flour, coconut, 1/4 cup sugar and salt.
Using a pastry blender, cut in the butter until the mixture resembles coarse crumbs.
Add the water and mix until the dough comes together. Press the dough into the prepared pie dish.
Bake in preheated oven for 15 minutes. Set aside to cool.
In a medium saucepan, mix together 1/2 cup sugar and cornstarch. Gradually stir in the milk.
Cook over medium heat, stirring constantly, until the mixture thickens and boils. Boil for 1 minute.
Stir a small amount of hot mixture into the beaten egg yolks; return all to the pan, stirring constantly. Bring to a gentle boil and cook for 2 minutes.
Remove from heat and stir in vanilla. Pour the filling into the cooled crust.
In a medium bowl, beat egg whites until foamy. Add cream of tartar, and continue to beat until soft peaks form. Gradually add 1/4 cup sugar, and continue to beat until stiff peaks form.
Spread meringue over the top of the pie, making sure to seal the edges. Bake for 15 minutes in the preheated oven, or until the meringue is golden brown.
Allow to cool before serving.
Interesting Facts
Flapper pie is a classic Canadian recipe that dates back to the 1920s.
The name "Flapper Pie" is thought to have come from the fact that it was a light, airy dessert that was popular with young women of the 1920s.
The original version of the recipe called for a custard or pudding filling, but modern recipes often use a meringue topping.