If you are going to Mont-Saint-Michel from Paris, you will probably need to transfer in Rennes. There is a nice french restaurant there, also nice for business meetings. It is just located steps from the rail station, and I think it is a good value.
One of the classic meat based dish from their menu is the Calf’s brain. So it a good occasion for me to taste this part of the animal. The meat comes with a special sauce made with Dijon Mustard, helping you forgetting the strong meat taste.