Do not preheat oven. Butter ... egg whites with cream of tartar until they hold ... time, beating; beat meringue until it is very glossy ... with their own spoons.
Bake pie shell. Reduce oven ... Stir in sour cream. Stir in egg yolks, ... Spoon Brown Sugar Meringue onto hot pie filling; spread ... in 1/2 teaspoon vanilla.