Peel and roughly dice the potatoes and cook in salted water for 20 minutes.
Cut the runner beans into narrow strips, boil in salted water for 6 minutes, quench and drain.
Drain the potatoes and let them steam out.
Heat the milk with the butter in a saucepan. Add the potatoes and roughly mash. Add the beans and savory and stir in. Season with salt, pepper and nutmeg.