ready in 14 d. 20 min.
Pare the zest from the lemons, taking care not to include the bitter white pith. Put the zest in a large clean jar and pour over the vodka. Cover with a tightly fitting lid and leave for 1 week, shaking the jar each day.
Put the sugar in a bowl and pour over the boiling water, stirring until the sugar has dissolved. Add the vodka and peel and leave for a further week, shaking the jar regularly.
Strain into bottles, adding a few strips of lemon zest to each bottle and seal tightly.