For the smoked salmon roulade with cream cheese, cut the pumpkin in half, remove the seeds and slice into thin strips with the skin.
In a saucepan, caramelize sugar and deglaze with apple juice. Add remaining ingredients, bring to a boil once and simmer for 5 more minutes. Add the pumpkin strips and let cool.
Peel black radish and grate finely. Marinate with salt and apple cider vinegar and let sit for 5 minutes. Squeeze and mix with sour cream and chives.
Mix cream cheese with chives and pour into a pastry bag. Place smoked salmon slices side by side on plastic wrap and pipe cream cheese lengthwise on one side. Roll into a small roll and refrigerate.
Portion before serving and arrange the smoked salmon roll with cream cheese with black radish salad and marinated pumpkin.