The Predictable and The Forgotten
Two great restaurants in Paris - La Coupole in Montparnasse and Le Train Bleu at the Gare de Lyon.
La Coupole is the predictable one but go there at lunchtime and enjoy the art/design gems. Le Train Bleu is often forgotten but you will not forget a roast lamb meal here. It's excellent and there's something in the play of futurism with the TGVs outside promising amazing French destinations in incredible time while the interior of the restaurant places you firmly in the 18th Century.