Chocolate Pie

½ cup cocoa or 2 squares bitter chocolate
2 Tbsp butter
1/3 cup flour
1 cup sugar
¼ tsp salt
2 ½ cups scalded milk
3 eggs, separated
1 tsp vanilla
Baked pie shell

Mix cocoa, flour, sugar and salt and add milk. Cook in double boiler. Add some hot filling to yolks and put into rest of filling. Cook til thick, about 15 minutes. Stir constantly. Add vanilla and butter. If using chocolate squares, melt chocolate and butter in double boiler and add other ingredients. Put in pie shell. Make meringue and put on top. Put in 350º oven 12 to 15 minutes.