Modern version of a traditional favorite.
Thinly slice leeks and wash thoroughly.
Melt the butter and sauté the leeks until softened. Add the potato and water and bring to a boil.
Cover and simmer for 40 minutes or until potatoes are tender. Puree until smooth.
Return mixture to a clean saucepan. Thoroughly stir in milk, parsley and pepper. Reheat without boiling. Garnish with parsley sprig, if desired.