After thoroughly washing the berries and removing the small green stems, put them in a medium sized saucepan. Heat it over a medium heat, pressing down on the berries to release the juices.

Bring to a boil then add the sugars and lemon juice. Reduce the heat and stir the mixture until the sugar dissolves.

Bring back to a boil again. Add 1 packet of liquid pectin and continue to stir often. Put on simmer and leave it to thicken up a bit.

In the meantime, sterilize your jars in a large pot on the stove. When jars are ready and your jam has been brought back up to a boil for a few minutes, bottle and seal the jam tightly.