The dried pea you need is a blue boiling pea, soak over night with either a stepping table or a teaspoon or two of bi-carb.
Rinse of and cover with fresh water and boil till they break down, you can add a little more bicarb but not to much, if you got stepping tablets (their white like a big mint) you may also have a green tablet you should add at this stage, or you can add a little green colouring if no tablet you will need to remove scum during the early stage of boiling. Also add some salt.
You can also add a bacon hock and cook it at the same time, makes a great meal.
You can also use pigeon peas, these make what called grey peas and bacon taste similair but are brown in colour not green and are eaten in the Black country and wolverhampton.
Don't forget to season with a little sugar and vingear, you can also use mint when sereving with lamb shanks.
You can also add