Make a kneading dough from flour, butter, sugar, salt, V-sugar, baking powder, rum and 1 egg and let it rest in the refrigerator for an hour.
After resting, cut out hearts from the dough and bake at 175 C for about 10-12 minutes.
Separate 1 egg. Beat egg whites until stiff. Mix with powdered sugar and lime juice. Strain the raspberry jam through a sieve and stir in up to 2 tablespoons with the icing.
Put the rest of the jam in a freezer bag and cut off a very small corner.
Spread the icing on the hearts and draw streaks with the jam. Decorate with silver balls and let dry well.