Isoletta has good vegetarian options including suppli, eggplant parmesan, salads and veggie pizzas.
JoJo burger has a veggie burger in addition to delicious mahi mahi burgers and other burgers.
La Creperie has some veggie crepes, a veggie burger, delicious salads and veggie specials.
Kiki e Mo has veggie paninis, a veggie burger, veggie bowls, avocado toast, salads and a delicious green smoothie.
Les Bananiers has loads of veggie pizzas.
Sand Bar at Eden Rock has a nice selection of veggie pizzas at lunch along with salads and one veggie pasta. There are fewer veggie options at dinner.
Bagatelle has a superb cacio e pepe with truffles along with a lovely eggplant parmesan, tempura veggies and several salads.
I had a refreshing cucumber and feta salad at La Petite Plage along with an excellent pasta I’m sure they could cater to a vegetarian by removing the ham.
Shellona has veggie mezzes, salads and a grilled vegetable side. I’m sure they would work with you to come up with a good veggie main option.
Fouquet’s has several veggie pastas and some veggie appetizers.
Hope this helps