No need to hull the strawberries - just slice off the green tops before cutting strawberries into quarters.
Juice the lemon and set aside the juice for later to add to the strawberry juice.
Cut the lemon zest into slices or chunks.
Place your strawberries in preserving pan along with the lemon peel and water.
Simmer on a gentle heat for 15 minutes.
Strain through a jelly bag / muslin bag for at least 2 hours, preferably overnight.
Measure the amount of strawberry juice. For every 600ml of strawberry juice you will need 450g of sugar and 100ml of lemon juice.
Add the lemon juice to your strawberry juice and then bring to a gentle boil in a preserving pan.
Add the sugar and stir until it has dissolved, ensuring the sides of the pan are free from sugar crystals.
Boil rapidly for about 12 minutes or until setting point is reached - 104C / 220F.
Try the wrinkle test, put a drop of the jelly onto a very cold tea plate. Wait a few seconds and then push the jam with your finger, if the jam wrinkles, it's ready.
Remove pan from the heat and skim off any foam.
Pour into warm sterilised jars and seal. If necessary, before sealing, bring any air pockets to the jelly surface. Use a sterilised knife to do this or tap the jar gently on the work surface.