Roasted Lamb Shoulder with Verbena Sauce and Baby Potatoes

Fresh verbena or lemon verbena is truly preferable for this dish, but if you do not have it, use some dried verbena tea (pure, please, not blended with other herbs) and simmer it in the stock before making the gravy. Verbena perfumes many stands of the Annecy market throughout the summer. Coeurs de pigeons are baby potatoes sold by the farmers, which one fries in butter without peeling.