Wash, halve and stone the apricots. Weigh 1 kg of flesh and cut into small pieces. Squeeze lemon. Mix lemon juice, amaretto, apricot pieces and jam sugar in a pot.
Leave to stand for about 30 minutes. Then heat up and simmer for about 4 minutes until bubbly. Immediately pour into clean glasses (preferably with twist-off lids) and close them tightly. Turn glasses upside down for about 5 minutes.
Turn over again and let it cool down. Store jam in a cool and dark place.