Put all the ingredients in a large Kilner jar and shake well to dissolve the sugar. Leave in a cool place and shake 2-3 times a week for 3-4 weeks until the liquid is a rich pink colour.
Set a large sieve over a large bowl and line the sieve with muslin. Strain the vodka though the sieve, then transfer to a jug and pour carefully into clean, dry bottles. Seal and label the bottles. The vodka is now ready to drink, or will keep in a cool, dark place for up to 1 year. Serve over ice or neat in chilled shot glasses, or make into a long drink topped with soda or fizz, adding half a strawberry just before serving.