For powidl, cook plums in a large saucepan, stirring frequently, for about 2 1/2 hours. Add finely chopped lemon skin, grated ginger and cinnamon and cook for another 3 hours, stirring constantly, until the puree has thickened completely and turned blue-black.
When it has thickened optimally, the powidl is already spreadable when hot. Fill into sterile jars while still hot.
The Powidl is refined with a little sugar and rum only before use.
Preparation Tip:
If you sterilize the Powidl in jars in a water bath or steamer, it will last in the cool cellar for at least half a year! So you quickly have your supply at hand!