Basil Grapefruit Cooler

Directions

1. 1
   Using a vegetable peeler remove the zest from 3 of the grapefruit and put the zest in a jar.
2. 2
   Pour over the vodka and leave to infuse for at least 24 hours.
3. 3
   Cut all the grapefruit in half and juice - if making ahead of time, freeze the juice until it's needed.
4. 4
   Pick the leaves from the basil and add the stalks to a small saucepan with the sugar and 1 cup of water.
5. 5
   Gently heat, stirring until the sugar has dissolved, then cool, strain and chill until needed.
6. 6
   Put half the basil leaves in a jug, pour over the vodka, 1 1/4 cups of basil stock syrup and the grapefruit juice and stir.
7. 7
   Fill 6 glasses with ice, the remaining basil and a little grapefruit zest (use the stuff from the vodka), and fill with cocktail mix.