Made at the Fromagerie in Courtelary, the Kämpf family utilize the perfect Chasseral grazing areas at 1,300 metres (4,265 ft) where the cows are outside for eight months of the year. For the colder months they are inside but fed only hay with a supplement of dried legumes. Château d’Erguel is one of the oldest cheeses from this region. The Erguel, which weighs around 7 kg (15½ lb), is matured for five or six months until the spicy flavours are well developed and full.