1. Add peas to a large pan, cover with an equal amount of water and leave to soak.
2. After 12 hours drain away old water and recover with same amount of water.
3. Bring to the boil then simmer for about 2 and half hours. This will depend upon the size of the portion. You will usually have to make enough to feed the entire population of Preston.
4. Add Salt. WARNING it is very important not to add salt too early in the process as the peas will remain hard and you will not be able to achieve the right consistency.
5. Continue to simmer until the peas are not too hard, but also not mushy. Just right! If done properly there will be a little juice left in the pan!

Put them in a cup and add vinegar and black pepper if you like.