By the friend's demand! :-)
2-4 leeks, chopped
seeds (e.g. sunflower, pumpkin, pine nuts)
Heat the frying pan, add olive oil (I've used pomace) and fry the seeds and nuts. Add chopped leek, both white and green parts and wait for it to become softer and glazed. Put it into a pot and cover with 2/3 of water and 1/3 of milk. Bring the soup to boil. Blend.
There are two ways of serving this easy and delicious soup.
1st way: with feta cheese. Just remember it's salty itself so do not add too much salt to the soup! I prefer feta in a jar, that comes with spices.
2nd way: sounds strange but is extremely tasty. Add sour milk and honey.