TheFork users who ate in Juvignac have said really good things about Les Frères Poulards, M by Mhr and Les Jardins de la Castelle. Maybe you should give them a try!
Some of the more popular Traditional restaurants that offer vegetarian options on their menu in Juvignac according to TheFork users include:
Les Frères Poulards, with a 8.7 rating
M by Mhr, with a 8.9 rating
Les Jardins de la Castelle, with a 8.9 rating
In those days what better than a traditional restaurant to retrieve the comfort of eating at home.