Nan'S Chocolate Pie
["1 c. sugar", "2 (1 oz.) sq. unsweetened chocolate, chopped", "1/3 c. flour", "1/4 tsp. salt", "2 c. milk", "3 slightly beaten egg yolks", "2 Tbsp. butter", "1 tsp. vanilla", "single pie crust, cooked"]
["In saucepan, combine sugar, flour and salt.", "Gradually add milk and chocolate.", "Cook and stir over medium heat until thick and bubbly, 2 minutes.", "Remove from heat.", "Stir small amount of chocolate mixture into eggs.", "Add to saucepan of chocolate. Return to heat; cook for 2 minutes.", "Remove from heat; add butter and vanilla.", "Pour into cooked pie shell.", "Top with whipped cream."]
["sugar", "unsweetened chocolate", "flour", "salt", "milk", "egg yolks", "butter", "vanilla", "pie crust"]