http://www.notquitenigella.com/2007/11/03/nigellas-dime-bar-ice-cream/
The recipe here says to pour into an ice cream maker at the end but if you don't have one, pour into a covered container and put it in the freezer. Then give it a quick beat on the hour, every hour for three hours. Its not as bad as it sounds once you're not in a rush!!