Le Monde has an article that you can only see the first part unless you're a subscriber. That part shows (to me) a graphic with the five restaurants mentioned labeled on a vague map of Paris. They give you a (partial) review of the first one, Pistil, and the rest of the reviews are behind the paywall. You can subscribe for the rest or just look them up in other places.
"Five affordable vegetarian restaurants in the Paris region"
"Craving a quinoa arancini, an Asian-inspired salad or a coconut dessert? Here is our selection of places in Paris and the suburbs where you can enjoy quality vegetarian food for under €20."