Wash the potatoes thoroughly and cook in a pressure cooker.
In the meantime, cut the bacon into small cubes and leave it in a saucepan. Add the flour to the fat and stir until it turns light yellow. Then pour in the milk while continuing to stir.
In the meantime, put water in a saucepan, add a little salt and cook the beans in it. Drain.
Pour a little bean water on the bacon sauce and add the beans. Season with pepper, savory and parsley and serve with the jacket potatoes.