Place finely sliced onion and leeks into a pan with the stock, on a low heat let these caramelize for 30 minutes whilst stirring occasionally
In a separate pan dry fry the sausages till crispy, as the fat comes out of them, spoon this into the leeks
Pop your pasta on to boil, with a few minutes remaining add the peas, drain and reserve some cooking water
Add all the ingredients together with some pasta water and stir till a thick sauce forms
