Wash the berries for jam well and sort, removing twigs and leaves. Throw away damaged or rotten berries so that they do not spoil the preservation. Dry the washed gooseberries and cut off the stems on both sides. Prepare jars and lids for canning.
Prepare the berries. Mash clean gooseberries with a masher or puree the berries using a blender. Add lemon zest to the berries and transfer the mixture to a thick-bottomed saucepan. Add a packet of pectin and stir.
Boil gooseberries. Place the pan with the berries over medium heat and gradually add all the sugar. Stir the confiture until the sugar is completely dissolved. Bring the berries to a boil, add lemon balm and cook, stirring constantly, for 5 minutes.
Pack the confiture into jars. Remove the lemon balm sprig from the confiture. Pour hot confiture into sterilized jars and roll up the lids. Turn the jars upside down and leave for 15-20 minutes. Then place the jars on the bottom so that the confiture gels in the correct position.
Place some of the gooseberry confiture in a deep jam bowl and garnish with a sprig of fresh lemon balm. Also fill shortcrust pastry tartlets with confiture and decorate with gooseberries on top.