In a frying pan, melt butter, add apples and cook for 5 minutes over low-medium heat. Then add honey and cinnamon and simmer for 5 min. Separate apples from sauce, let both cool down.
In a bowl, beat egg yolks with sugar until creamy, then add mascarpone and whisk for a few minutes.
In a separate bowl, beat egg whites with salt. Transfer the mixture into egg yolks/mascarpone and gently fold using a spatula.
Roughly crush the biscuits.
In serving glasses (makes 6), place layers in the following order: 2 biscuits, 1 tsp apple juice (from the caramelized apples), 1 tbsp mascarpone, 2 tbsp apples. Repeat the layers.
Place in the fridge for at least 5 hours before serving.