Doggy bags have long been frowned upon in France as an affront to gastronomic etiquette, but restaurants are now legally obliged to provide them if requested by diners, in a move to cut food wastage.
The new regulation, which came into force on New Year's Day, applies to restaurants serving more than 180 meals a day.
It is aimed at encouraging the French to overcome their reluctance to eat their leftover pot au feu or coq au vin at home the next day.
The Government wants to reduce the seven million tonnes of food thrown away each year in a country where 3.5 million people depend on free meals handed out by charities.
The catering trade is responsible for 14 per cent of this waste but most French diners never ask for doggy bags for fear of appearing ill-mannered, stingy or unhygienic.