Runner Bean Mash (Snijbonen Stamppot)

Wash and chop the runner beans. Place in a saucepan with salted water and bring to a boil. Cook the beans for about 10 minutes or until al dente. Drain and set aside. Meanwhile, add the potatoes and cook until tender. Heat a small skillet with a little butter and sauté the onion until translucent. Add the garlic and cook briefly. Add the runner beans to the pan and stir-fry for a few minutes. Meanwhile, mash the potatoes with a masher. Add a knob of butter and a splash of milk. Add the bean mixture and grated cheese. Season with salt, pepper and mustard. Fry the bacon and serve with the bean mash.