Preheat the oven to about 200 degrees. Cut the potatoes into pieces one centimeter high: they must look like small cylinders. Season them generously with salt and pepper.
In a large pan, add the oil and heat it for a few seconds over high heat, but without burning it. Cook potatoes until golden on the bottom, about 5 minutes.
When the bottom of the potatoes has turned golden, turn them gently and add the butter, garlic and rosemary. Cook potatoes for another 5 minutes, until the other side of the potatoes is also golden.
Now add the hot chicken broth to the pan and place the pan in the oven.
Cook the potatoes until tender: about 25-30 minutes. Once cooked, cover them with chopped rosemary and serve.