A custard pie is a milk, egg, and sugar mixture baked in a crust. Aunt Pit's recipes are often incomplete, because she assumes everybody knows what to do. If you don't, here's how:
Bake pie shell at 400° for 5 minutes. Set aside.
Combine ingredients and blend well. If the recipe calls for egg whites, beat them separately until they form peaks and fold them into the mixture.
Pour filling into partially baked pie shell.
Bake at 325° for about 50 minutes until an inserted knife comes out clean.
Do not overcook.