1) Dice the potatoes and grate the carrots.
2) Chop the parsley, onion and leek.
3) In a pan, melt the butter, add the potatoes, leek and onion.
4) Saute the vegetables over a gentle heat.
5) Add the stock and seasoning and simmer gently until the vegetables are soft.
6) Serve the potato vegetable soup hot while garnishing with carrot and parsley.