Slice and dice Leeks using some of the green part too.
Peel wash and dice potatoes into cubes.
Melt butter into a big pot with the leeks and potatoes
Stir and cook for 4 minutes.
Add 2L of water or chicken stock and cook until vegetables are soft.
When all cooked blend with stick blender or masher till smooth.
Serve with a little cream and finely chopped chives.
Salt and pepper to taste.