8 or 9 in. pie crust
1/4 c. butter
1 1/2 1 oz. squares of chocolate (unsweetened)
1 1/2 c. sugar
1 tbsp. flour
1/2 c. evaporated milk, undiluted
2 eggs
few grains salt
1 tsp. vanilla

Preheat oven to 350°F. Place butter and chocolate in small saucepan and melt, stirring constantly. Pour mixture into a small bowl; add sugar, flour, milk, eggs, salt and vanilla. Beat mixture at moderate speed 5-7 minutes until thick and creamy (scrape bowl occasionally with spatula). Pour into unbaked pie crust and bake 40-45 minutes until filling is firm.