Mastering the Art of French Cooking... doesn't mean it has to be fancy cooking, although it can be as elaborate as you wish.
Julia ChildI found that the recipes in most - in all - the books I had were really not adequate. They didn't tell you enough... I won't do anything unless I'm told why I'm doing it. So I felt that we needed fuller explanations so that if you followed one of those recipes, it should turn out exactly right.
Julia Child