Crunchy Crumb Mixture:2 slices brown bread or 2 brown rolls- whizz in food processor to make crumbs.
Whisk together until floppy (be careful not to overbeat until too stiff):
Fold together double cream mix, egg white mix and crunchy crumb mix. Pour into container and freeze for at least 4 hours. Move to refrigerator for 20 mins before serving to soften slightly.