Paris is one of the great food cities of the world. You can easily spend 400-500 euros per diner at restaurants like Alain Ducasse at the Plaza Athénée Hotel or at at Guy Savoy's joint in the 6th arrondissement. But why spend all that money when you can eat well on 25 euros or so? Where are the cheap but good restaurants in Paris? Let The Professor tell you in this Paris blog post.