Storage: Store the cake in the refrigerator to keep the whipped cream fresh. Consume within 2-3 days.
Substitution: If kirschwasser is unavailable, you can use cherry brandy, amaretto, or even cherry juice for a non-alcoholic version, though the flavor will be less traditional.
Variation: Some traditional recipes use buttercream frosting instead of whipped cream. If you prefer a richer cake, consider using buttercream, but whipped cream provides a lighter, more refreshing contrast to the chocolate.