In Paris, a traditional "bouillon" is a rather large restaurant serving traditional meals to the masses at affordable prices.  In general, the food is good and the price is right.  In this blog post, The Traveling Professor reveals his best bouillon restaurants in Paris. 

Bouillon Julien:  One of the most classic of dining rooms in all of Paris, dining in that room is worth the price of the meal alone.  An endive salad, fish and chips, finished off with baba a rhum is just 21 euros.  Here is the complete carte (menu) in French: https://www.bouillon-julien.com/menu.   16 rue du Faubourg Saint-Denis, 10th Arrondissement, www.bouillon-julien.com.

Bouillon Chartier:  It's a large dining room with big brassy fixtures and tall mirrors.  Waiters are traditionally dressed and the service is quick and snappy.  The Professor usually starts off with a half dozen escargot, steak frites, and finishes it up with a chocolate mousse all for under 22 euro.  A bottle of Cote du Rhone at 13 euro is all it takes to wash it all down.  Here is the menu: https://www.bouillon-chartier.com/grands-boulevards/la-carte/.  The original location is in the 9th at 7 Rue du Faubourg Montmartre.  A newer location in Montparnasse is in the 6th at 59 Boulevard du Montparnasse.  The website is: https://www.bouillon-chartier.com/.

Bouillon Pigalle:  The new kid on the block in the lively area of Pigalle is always crowded.  But if you show up early, you should get a spot.  What The Professor would order is the terrine de campagne to start followed by traditional bœuf bourguignon as the main course.  For dessert, it is a close call between the lemon tart and the rice pudding all for under 25 euros.  22 Boulevard de Clichy is the original location and another location is in the 3rd at 39 Boulevard du Temple.   Here is the website: https://bouillonlesite.com/bouillon-pigalle

By the way, French menus can be difficult to understand but if you purchase a copy of Eating and Drinking in Paris, the menu translator will make it crystal clear as to what the diner is ordering.

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For more Paris resources see: https://profrabbit.com/paris-travel-guide/