1. Drain the trotters and split and crack them in several places.
2. Put into a saucepan and cover with some fresh water.
3. Bring to the boil and simmer gently until tender. Drain and place in a heatproof dish.
4. Put the remaining ingredients in a saucepan and bring to the boil.
5. Boil for a few minutes, then pour over the trotters.
6. Leave to cool, then keep in a cool place for 24 hours.