Grapefruit Squash (low-cal)

100g canderel sweetener (aspartame)
28g citric acid
5 grapefruit
1l water

In a pan, grate the zest off the grapefruits and add the sweetener, citric acid and water. Heat in the pan to just under boiling then let it cool.

Juice the grapefruits and add the juice the the cooled pan.

Leave overnight (or an hour, depending on our patience) in the fridge, and then sieve.

Add 1 part squash to 3 parts water or soda.

Keeps in the fridge for 2 weeks.