Sift together sugar, flour, salt, and chocolate. Beat egg yolks well and mix with milk; combine with dry ingredients. Beat egg whites stiff and fold into chocolate mixture, mixing well. Pour into pie shell. Bake in a hot oven (450ø) for 10 minutes, then reduce the heat to moderate (350ø) and bake until firm. Test by inserting a knife blade; when it comes out clean, the chocolate sponge is done. Serve cold with whipped cream or ice cream.
from "Sunset Cook Book of Favorite Recipes", 1949, edited by Emily Chase
