Peel and dice potatoes finely. Clean the leeks and slice one of them roughly, the other finely. Shred the apples, roughly. Saute the potatoes and the roughly cut leek, with salt and pepper. Add the apples. Turn and add water. Let it boil until the potatoes are tender and blend the soup while adding olive oil (add, if you like, a splash of white wine). Sprinkle with the finely sliced leek and serve...