architecture castle history landscape ruins aggregatum allium-cepa banana-shallots brown bulbs bulk Cuisse-de-Poulet-du-Poitou cuissen cultivars delicate-piquancy echalions edible elongated flavonoids flavor flavour food gourmet gourmet-cooking hardy healthy heritage-variety layers mild nutritious odor odour onion-shallot-cross onions paper-thin papery-skin peel peeling pink-skinned-bulbs pink-tinge piquant pungent quantity raw shallot-onion-cross skins sweet tasty thin torpedo-shaped torpedoes Turkish-onion vegetable zebrune