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SERVES 4
320g/11oz/2½ cups frozen blackberries
320g/11oz/2 cups frozen blackcurrants
320g/11oz/2½ cups frozen raspberries
320g/11oz/heaped 2 cups frozen strawberries
100g/3½oz/heaped ⅓ cup caster sugar
250ml/9fl oz/1 cup Greek yogurt
Put about half the frozen berries in a bowl, sprinkle over half the sugar and leave to thaw at room temperature. Put the remaining berries into a food processor or blender with the yogurt and remaining sugar and blend until smooth and creamy. Check the sweetness, adding a little more sugar if needed. Scoop the mixture into 4 bowls, spoon the thawed berries over the top and serve immediately.