These fillet steaks with mustard sauce and Hasselback potatoes are a gourmet meal that is sure to impress. The tender fillet steaks are cooked to perfection and served with a creamy mustard sauce that adds a tangy and savory flavor. The Hasselback potatoes are crispy on the outside and soft on the inside, making them the perfect accompaniment to the steaks. This dish is perfect for a special occasion or a romantic dinner at home.