Chilled Blackberry Snow

Ingredients

 * blackberries - 450 g, (1 lb), fresh or frozen, thawed,
 * egg whites - 2,
 * caster sugar - 50 g (2 oz),
 * double cream - 300 ml.

Directions

 * 1) Purée the blackberries and rub through a nylon sieve.
 * 2) Pour the purée into a rigid container and freeze for about 2 hours.
 * 3) Whisk the egg whites until stiff, then add the Sugar gradually, whisking until the mixture stands in soft peaks.
 * 4) Whip the cream until it just holds its shape.
 * 5) Remove the frozen blackberry purée from the freezer and mash to break down any large ice crystals, being careful not to break it down completely.
 * 6) Fold the cream and egg whites together, then quickly fold in the semi-frozen blackberry puree to form a swirled effect.
 * 7) Spoon into tall glasses and serve immediately.