Cook the pasta in boiling salted water according to the instructions on the packet. In the meantime clean, wash and cut the beans into small pieces. Cook in boiling salted water for about 20 minutes, drain.
Cut the sage leaves into fine strips. Heat the lard in a large ovenproof pan. Stir-fry the pasta, beans, sage and pine nuts briefly while stirring. Season with salt and pepper. Whisk eggs and milk.
Season with salt and pepper. Spread on the pasta pan. Leave to stand for 5 minutes over medium heat. Grate the cheese and sprinkle over the pasta. Bake in the preheated oven (electric: 225 °C/ gas: level 4-5) for about 12 minutes.
Serve in portions with Bündnerfleisch and fresh sage.