Old Fashioned Sweet Potato Pie

Ingredients

• 2 cups cooked, mashed sweet potatoes
• 1 cup firmly packed brown sugar
• 1/2 cup butter or margarine, softened
• 2 eggs, separated
• 1/2 tsp. ground ginger
• 1/2 tsp. ground cinnamon
• 1/2 tsp. ground nutmeg
• 1/4 tsp. salt
• 1/2 cup evaporated milk
• 1/4 cup sugar
• 1 unbaked 10-inch pastry shell