Chocolate Pound Cake
["2 3/4 c. sifted flour", "3/4 tsp. cream of tartar", "1/2 tsp. baking soda", "1 1/2 tsp. salt", "1 3/4 c. sugar", "1 c. soft margarine", "1 tsp. vanilla", "3 eggs", "1 egg yolk", "3 sq. chocolate, melted", "powdered sugar", "2/3 c. milk", "3/4 c. nuts (optional)"]
["Sift first 5 ingredients together in a bowl and drop in shortening, adding milk and vanilla and mixing on low speed for 2 minutes.", "Add eggs and chocolate; beat 1 minute.", "Turn into a 9-inch tube pan and bake in 350\u00b0 oven for 1 hour 10 minutes.", "Just before serving, spoon powdered sugar into top of cake."]
["flour", "cream of tartar", "baking soda", "salt", "sugar", "margarine", "vanilla", "eggs", "egg yolk", "chocolate", "powdered sugar", "milk", "nuts"]