In a bowl, whip the heavy cream until stiff peaks form.
In a separate bowl, combine the mascarpone cheese, honey, vanilla sugar, and lemon juice. Mix until smooth.
Gently fold the whipped cream into the mascarpone mixture until light and airy.
Add the ground walnuts and, if desired, a pinch of cinnamon to the cream. Mix well.
Place a layer of crumbled sponge cake at the bottom of each glass or parfait dish, then drizzle with a little honey.
Spoon a layer of the walnut-mascarpone cream over the sponge cake, and repeat the layers until the glasses are filled.
Garnish the top of the parfaits with roughly chopped walnuts and, if desired, a sprinkle of cinnamon.
Refrigerate for at least 1 hour before serving to allow the flavors to meld and the cream to set slightly.
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