Peel the membrane from the saddle. Slice the beetroot into rounds. Pan-fry the saddle in 20 g butter and brown on all sides for 5 minutes. Remove and keep warm.
Add the pepper to the pan, flambé with cognac and deglaze with white wine. Make a sauce by whisking 50 g of butter into the juices.
Cook the spinach and beetroot in this juice. Slice the saddl