French onion soup and mussels a la mariniere are typical examples of French bistro food. Coq au vin, which is chicken in wine, is a classic dish. American bistros may also serve roast pork, Italian dishes made with portobello mushrooms and Asian duck. Although the food is served quickly in most bistros, the preparation time can be very long for the cooks as many dishes need marinating and/or long, slow cooking times.