Have your fishmonger kill the lamprey and ask him to save the blood.
Peel and crush the garlic. Peel the onions and slice. Slice the jambon into thin strips.
In a heavy saucepan, sauté the garlic, onions and jambon
in the butter until brown, coat with the flour, and add the Bordeaux, the bouquet garni and the leeks. Allow to cook for 1