Chocolate Sponge Pie

1 c Sugar
1/3 c Flour
1/4 ts Salt
1/2 c Ground chocolate
3 Eggs; seperated
1 c Milk
9 Inch unbaked pastry shell

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.