Bake pie crust according to package directions. Let cool. Toss sliced bananas with lemon juice and spread bananas in the bottom of the baked pie shell. In a pot on top of the stove, mix milk, salt, egg yolks, cornstarch, sugar, vanilla with a spoon or whisk. Add margarine in one piece. Cook on medium high heat about 5 to 7 minutes stirring constantly with whisk. This will burn easily. Mixture will thicken like pudding. Remove from heat and pour over sliced bananas. Let cool before adding meringue.
Meringue Ingredients
Beat egg whites with mixer, add sugar and vanilla, and continue beating until peaks form. Spread on top of pie covering entire pie. Place under oven broiler until browned or bake in preheated 350 degree oven until brown on top.