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Fill a large saucepan with water and salt and bring to a boil. Meanwhile, peel and roughly chop the potatoes. Cook the potato in about 15 minutes, the exact cooking time depends on the size of the pieces.
Fill a medium saucepan with water and salt and bring to a boil. Remove the ends of the flat beans and cut them into thin pieces. Peel and finely chop the onions.
Fry the bacon in a medium-sized skillet for a few minutes. Sauté the onions for a few more minutes and set aside.
Cook the flat beans in the medium-sized pan for a few minutes, making sure they are not overcooked. They are best when they are al dente.
Drain the potatoes and mash them roughly with a potato masher. Stir in the flat beans and fried bacon and onions.
Create a smooth mash with a good splash of milk and a knob of butter. Season with nutmeg, pepper, salt and a tablespoon of mustard. Serve with a smoked sausage if you like, enjoy!