Wash the grapes, then pick them all off the stems and place them in a medium-sized pot with the water.

Cook the grapes on medium heat for 10 -15 minutes, stirring frequently, until they become soft and start to break up.

Add the sugar and cook gently for 2 more minutes.

Add the wine and leave the grapes to cook for another 2 or 3 minutes until you cannot smell alcohol boiling off anymore.

Take off the heat and leave to cool.

When cool, pass the grapes through a mill, or squash them through a colander to remove the skins and seeds.

Place in the fridge for at least 2 hours, but preferably overnight.

Use an ice-cream maker to churn the mixture into sorbet.