Peel and core the apples, then puree them until smooth.
Separate the egg whites from the yolks.
In a large mixing bowl, combine the apple puree, egg whites, and sugar.
Beat the mixture vigorously until it becomes fluffy and forms stiff peaks.
Preheat the oven to the specified temperature.
Pour the mixture into a greased baking dish.
Bake the pastila until it is set and lightly golden on top.
Allow the pastila to cool completely before slicing and serving.
Enjoy this decadent marshmallow-like dessert that was a culinary jewel of Imperial Russia.
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