The three sauces to choose from are Sauce Robert, Sauce Bordelaise and Sauce Noir. Any pedant will tell you that Robert is an old classic: white wine, onions, mustard, reduced stock. Tangy and rich. At Aubaine it comes as brown jus with a belt of truffle oil, and when you have been asked to pay £17.25 for a small steak, stumping up another £3.75 for a few Pont Neuf potatoes seems a liberty, even if the 'big chips' are very sound.