Okay...
Leek and Potato soup from the lovely Delia Smith
Melt 50g butter in large pan.
Add 4 large leeks,(finely chopped and rinsed very well), 1 medium onion, chopped, and 2 medium potatoes, peeled and diced.
Stir well, season with S&P. Put lid on and cook over low heat for 15 mins.
Then add 1.5 pints of light chicken stock or water (I used veg stock as dd is a vegetarian) and 275ml milk. Simmer gently for 20 mins.
Blend to desired smoothness!
Before serving, reheat and add chives and a swirl of cream (I forgot this bit and it was stil lovely)