1. For the pudding, empty the first six cups and the nuts. If using, into a mixing bowl with the spices.
2. Stir in the milk and egg.
3. Once well combined, tip into a buttered 1.5 litre pudding bowl.
4. Cover with a double layer of buttered foil, making a pleat in the centre to allow the pudding to rise.
5. Tie the foil securely with string.
6. Place in a steamer or large pan containing enough gently simmering water to come halfway up the sides of the bowl.
7. Steam, covered with a lid, for 2ó hours.
8. If you are preparing this pudding ahead, remove the foil. Let it cool slightly, then wrap in cling film and then fresh foil.
9. If you are serving it immediately, unwrap and invert onto a deep plate.
10. For the sauce, put everything in a pan and bring slowly to a boil, stirring.
11. Allow to bubble away for 2-3 minutes, still stirring, until the sugar has dissolved and the sauce is pale caramel in colour and slightly thickened.
12. Remove from the heat.
13. Pour the sauce over the pudding and decorate with the whole mixed nuts.
