In the food processor, blend the lime zest, lime juice, chillies, sugar and water. Blend this until the chilli is finely chopped and the sugar is all mixed in.

In the mixing bowl, lightly whip the cream with a fork, until its sloppy.

Empty the contents of the food processor and bowl into the freezer proof tupperware. Place in the freezer.

After an hour, go to the freezer and take out the tupperware. Using a fork, break up any ice crystals that have formed in the ice-cream. Replace the lid, and pop it back in the freezer.

Repeat this, every hour or so until it is completely frozen (normally around 4 hours). Also don't worry if you don't remember to do this. I've done that with a couple of batches, and its has still turned out delicious.