Remove the meat from the fridge approx. 30 mins. prior to cooking. Heat the oil in a non-stick frying pan. Season the meat, brown on all sides for approx. 5 mins. over a medium heat. Remove, place in a casserole dish.
Heat a little oil in the same pan. Reduce the heat, stir fry the fennel for approx. 5 mins. Add the apples and sage leaves, cook for approx. 5 mins., season with salt. Stir the cornflour into the Calvados and apple juice, pour into the pan while stirring, reduce for approx. 2 mins. Transfer the vegetables and sauce to the dish containing the meat.
To roast in the oven
Approx. 20 mins. in the centre of an oven preheated to 200°C.