Frozen raspberry & blackberry yoghurt

Method

Using an ice cream maker

1. Whiz the berries with the apple concentrate in a blender to make a purée, then pour into the ice cream maker, with the yogurt, cream and vanilla extract. 
2. Churn until frozen, then transfer to a freezer-proof container and freeze until needed.

To make by hand

1. Mix the yogurt with the cream and vanilla extract. 
2. Put in a freezer-proof container and freeze for 30 minutes. Meanwhile, whiz the berries with the apple concentrate in a blender to make a purée. 
3. Take the yogurt mixture out of the freezer and stir well with a fork to break up the forming ice crystals. 
4. Mix in the fruit purée. 
5. Freeze for another 1–2 hours until it starts to form crystals around the edges. 
6. Stir with a fork, freeze for 2 hours and stir once more, then leave to freeze until needed.