Classic Chocolate Cream Pie

Ingredients

• 2 1/2 blocks (2 1/2 oz.) Hershey's unsweetened baking chocolate, broken into pieces
• 2 c. milk
• 1 1/3 c. sugar
• 3 Tbsp. flour
• 3 Tbsp. cornstarch
• 1/2 tsp. salt
• 3 egg yolks
• 1 c. milk
• 2 Tbsp. butter or margarine
• 1 1/2 tsp. vanilla
• 3 egg whites (room temperature)
• 1/4 tsp. cream of tartar
• 6 Tbsp. sugar
• 9-inch pastry crumb crust