For the Christmas jam, mix agar-agar with half of the red wine using a whisk and let it swell for some time.
Bring remaining red wine with apples, plums, lemon juice and zest, gingerbread spice and sugar to a boil and boil for 5-10 minutes until bubbling.
Stir stirred agar-agar into the boiling mixture with a whisk and bring to a good boil again for 2 minutes. Make a jelly test. Stir in rum and almond flakes and pour the Christmas jam into prepared hot jars.
Using an eyedropper, drizzle a few drops of alcohol over the top, light and seal immediately. Leave the jars to stand still at the beginning and do not move them, so that the mixture can set well.