Bring the juice to the boil and add the preserving sugar. Let cook according to the instructions on the packet.
Fill into mason jars. I take small 200 ml. Screw jars and then turn them upside down.
The jam is super simple and just tastes wonderful. Also very suitable for coating cake bases - for example for buttercream cakes instead of apricot jam, or for Christmas baking for coating lemon ovals or the like.