What part of the leek do you cook?
the main boddy i.e. where its more dense, although for a younger leek you could cook it all easely and it'll be delicious
onion garlic butter potatoes leeks veg stock sweat garlic and diced onion in butter till soft. add chopped par boiled potatoes and cook till softening. add leek and cook till a little softer. add stock and cook till potatoes are very soft. add the dark green leaves of the leeks for colour and cook for 2 minutes. blend.