Grapefruit and ginger vodka

Method

1. Spoon the zest into the preserving jar or bottle, pour in the vodka, then seal and shake. Keep in a cupboard for 1-2 weeks. Wrap and keep 2 of the zested grapefruit in the fridge for later on in the recipe (use the rest in another recipe, or eat).
2. After 1-2 weeks, put the ginger in a saucepan with the sugar and 500ml cold water. Squeeze in the juice from the 2 reserved grapefruit, then bring to the boil. Leave to bubble for 2 minutes, then remove the syrup from the heat and cool.
3. Stir the infused vodka into the syrup, then strain through a fine sieve into a large jug. Decant into a sterilised bottle/bottles and drink well chilled (see tips).