Make a bunch of the well washed leaves of one of the leeks, [parsley stalks and the onion skins. Wrap them in a cheesecloth and secure with string at either end.
Put the vegetables in a large saucepan with the meat, rice and the bunch of flavoring leaves. Add a little salt and pepper and cover with cold water. Bring the mixture slowly to a boil, skim it once or twice, then cover and simmer over low heat for 2 hours.
Remove the meat bones and the bunch of skins. Check the seasoning. Sprinkle the parsley on top just before serving.