Chocolate Meringue Pie

This is my Memaw's Chocolate pie recipe that has been a family favorite for years. (She has to make two at Christmas so that nobody argues over it, it is that good)

Custard
1 Cup Sugar
5 Tbs Cocoa
3/4 Cup Flour
1 3/4 Cup Milk
3 Egg Yolks
2 Tbs Butter
1/2 tsp Vanilla

Meringue
3 Egg Whites
1/2 Cup Sugar
1/2 tsp Cream of Tartar

Custard
1. Pre-heat oven to 350 degrees and bake crust until golden brown. Remove from oven and allow to cool while making custard. (Do not turn off oven)
2. In a sauce pan, mix sugar, flour, and cocoa together in a sauce pan.  Over medium heat, add milk, stirring constantly to avoid scalding. Stir until mixture starts to thicken.
3. Take off heat and add yolks, stirring quickly. 
4. Add vanilla and butter, stirring until well mixed
5. Pour custard into crust

Meringue
1. In a medium sized bowl, blend cream of tartar and egg whites until mixture is frothy. (For a higher volume meringue, use room temperature egg whites)
2. Add sugar in a little at a time until egg whites are glossy and firm.
3. Pour over custard and mold into shape you want, put in oven until tips are golden