Wash and rinse the glass jars or bottles and their lids

Put the wet glass jars on a baking tray upside down.

Place bottles on their sides.

Before you start to make your preserve, put the tray with the glass jars or bottles into the oven at 120C (250 F) for 20 minutes. There’s no need to preheat the oven.

Put the lids into a heatproof bowl or jug and pour boiling water from the kettle over the lids, leave for 10 minutes.

Carefully drain the water and lift out the lids onto kitchen paper to dry.

Take the jars or bottles out of the oven and fill them with the hot preserves Be very careful as everything will be very hot. Put on the lids.

When the jars have cooled check that the lids are tight and tighten further if needed.