The Clos-du-Roi mushroom farm in Saint-Ouen-l'Aumône (Val-d'Oise) produces a thousand tonnes of button mushrooms every day. Third generation at the head of an operation created by his grandfather in 1949, the forty-year-old is one of the last producers in Île-de-France.
Its products, incubated in a former one-hectare stone quarry, a maze of labyrinths and cultivation rooms where the temperature oscillates between 15 and 17°C, delight consumers.