Peel, quarter, core, and cut the apples into pieces.
In a large pot, combine the apple pieces with the cinnamon sticks, lemon peel, 4 tablespoons of lemon juice, water, the scraped vanilla pulp and pod, and 60 g sugar. Bring to a boil, then reduce heat to medium and cook for 10 minutes.
Let the apples cool slightly. Reserve roughly a quarter of the cooked apple pieces, then pass the remaining apples through a fine sieve. Stir the sieved apples back together with the reserved pieces, taste, and add more sugar if needed. Cool completely to room temperature.
In a bowl, mix the mascarpone, vanilla yogurt, remaining 1 tablespoon of lemon juice, and remaining 30 g sugar until smooth.
Coarsely crush the Amarettini biscuits. Layer the crushed biscuits, apple sauce, and mascarpone cream in a bowl.