Add a few dried herbs to the potato croquettes if you wish. Simmer the potatoes in lightly salted water for 15 minutes, or until tender. Drain and mash thoroughly, preferably with a ricer.
Add the beef and vegetable mixture to the potatoes, sprinkle in 1 tsp of salt and some black pepper and mix well. Refrigerate for at least one hour, or until well chilled. Taste the croquette ...