For the medallions, pat the meat dry and cut a small pocket into each. Pluck or cut cheese into pieces. Put 1 slice of Bündner meat and some cheese in each meat pocket.
Pin it with wooden skewers. Season with salt and pepper.
Preheat oven (electric cooker: 150 °C/circulating air: 125 °C/gas: see manufacturer). Heat 2 tablespoons of oil in a coated frying pan and fry the medallions on each side for about 2 minutes. Place them on a baking tray lined with baking paper.
Bake in the preheated oven for about 20 minutes.
For the Rösti, knead the potato pancake batter with egg and milk. Heat 2 tablespoons of oil in a coated pan (28 cm Ø). Put the dough into the pan and smooth it down. Bake at medium heat for 6-8 minutes until golden brown.
Turn with the help of a flat lid or plate and continue baking for about 6 minutes. Cut the Rösti into eight pieces and arrange with the medallions. Serve with a leaf salad with tomatoes.