Use a vegetable peeler to remove the skin of the lemons in strips. You don't want the bitter white pith though. If your peeler is removing lots of pith then chuck it out.

Put your lemon peel into a wide necked carafe or big Kilner jar then pour over your vodka and pop the lid on. Put it in a cupboard and leave to infuse for a week. Give it a good shake every day if you remember

A week later put your sugar and water in a saucepan and heat whilst stirring until all the sugar is dissolved then bring to the boil. Once boiling reduce heat and simmer for 10 minutes until syrupy.

Strain your lemon infused vodka though some muslin or a sieve into a jug then very slowly and carefully pour it into your hot syrup. Be careful - it will spit

Let it cool completely then pour it into bottles and leave it in a cupboard for about 10-15 days

You can now decant it into smaller bottles to give away as gifts or just put it straight into your freezer.