Various, Book of American Baking
“ Many bakers have trouble with watery custard pie. This is caused from baking too long. A custard pie is baked as soon as it is firm, no matter what color it may be, and must be taken from the oven. Often times it is the fault of the milk (fresh cow milk, I mean) ; therefore, I made good use of the dry milk. This dry milk helps to thicken the custard, makes the pie sweeter and firmer. If you mix 4 lbs. sugar, 1 lb. lard, or butter, in a bowl, add 2 qts. of egg yolks, then 2 lbs. spring flour, 1 lb. dry milk, you will have a regular dough. ”
