30 mins
Heat the oil in a large frying pan and saute the leeks for 10 minutes until softened.
Add the sausages and fry for 5 minutes to brown, transfer to a dish.
Stir in the flour and cook for 30 seconds before gradually adding the stock, Worcestershire sauce and mustard.
Bring to a simmer and return the sausages to the pan.
Simmer for 15 minutes until the sausages are cooked and the leek gravy has thickened.
Serve with steamed kale and mashed potato.
