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Preparation:
Break the eggs, separating the yolks from the whites. In a bowl, work the butter with the sugar and vanilla extract until you get a creamy consistency.
Whip the egg whites with a pinch of salt until stiff, then gradually fold them in: first a little to loosen the mixture, then the rest with a spatula.
Peel and core the apples, cut them into cubes and add the lemon juice to prevent them from blackening. Fold them into the mixture. Butter and flour a springform pan, then pour in the mixture. Bake for 45 minutes.
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