Ingredient :

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3 eggs, separated
1 stick of butter (8 tablespoons), softened
3/4 cup sugar (alternately, 1 to 2 teaspoons stevia) or to taste (plain white powder)
2 cups flour
2 teaspoons cinnamon
1 teaspoon baking soda
1/2 teaspoon salt
1teaspoon vanilla extract
6 cups tart apples, cored and thinly sliced (add lemon juice or zest if apples are tasteless)

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Method :

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Preheat oven to 350 degrees. Place 2 cups of apple slices in a saucepan and partly cover with water. Simmer the apples until tender. Put them through a blender until evenly pulped.

Stir together egg yolks, sugar, butter, and applesauce. Combine flour, cinnamon, baking soda and salt in small bowl. Stir flour mixture and vanilla into applesauce mixture. Beat egg whites until slightly foamy in a medium bowl, and add to other ingrediants. Spread remaining apples in buttered baking pan or springform pan. Spread applesauce mixtures over apples.

Bake 35 to 40 minutes until knife inserted in center comes out clean.