Peel, core, and grate the apples. Toss them with lemon juice to prevent browning.
Soak the gelatin in water, then gently heat it over low heat until completely dissolved.
In a large bowl, beat the quark cheese until smooth with the sugar. Add the grated apples and cinnamon.
Whip the heavy cream to stiff peaks. Gently fold the whipped cream into the quark-apple mixture.
Add the dissolved gelatin and mix thoroughly until the consistency is uniform.
Place the sponge cake base in a cake pan and pour the quark-apple cream over it. Spread the top evenly.
Refrigerate the cake for at least 4 hours to allow it to set completely.
Once set, remove the cake from the pan and garnish the top with thin apple slices and a pinch of cinnamon.
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