Wash the grapes and remove them from the stems. Then chop with a hand blender. Add the juice from the orange and lemon. Peel the mandarins and cut into small pieces and add to the jam with the pomegranate seeds. Finally stir in the rum, preserving sugar, glaze, cloves and cinnamon. Let stand for 1 hour. Then bring to the boil and simmer for at least 4 minutes. Carefully remove the resulting foam with a slotted trowel.
Pour the jam into the jars rinsed with hot water and close. Then turn the glasses upside down for 10 minutes, turn them over again and let them cool down.