Clean the chickens from feathers and impurities. Season with salt and olive oil.
Add the chickens to an oven dish and roast them in the oven at 180°C for 45 minutes. Now add the butter and roast for 15 more minutes whilst basting the chickens with the butter.
Leave the chickens to rest for 15 minutes before carving.
Decorate a serving tray with chicory and coriander and serve the chickens hot.