Rinse glasses with hot water and let them drip off. Wash the apricots, dab dry and stone them. Weigh 1 kg flesh and cut into slices. Mix apricots and jam sugar well in a pot.
Bring everything to the boil while stirring over high heat. Boil for at least 3 minutes while stirring continuously. Stir in the brandy. Pour immediately into the prepared glasses. Close with twist-off lids, turn them over and let them stand on the lid for about 5 minutes.