There is a large selection of dishes to serve as a side to the main course. Mainly based on Mediterranean vegetables, those recipes well complement meat or seafood. Most of those side dishes have no eggs or dairy so they are suitable for vegan dinner.
Some are very easy to do, like a summery Baked Ratatouille or a wintering Gratin Dauphinoise. Some that require a bit more work but incredibly delicious like the Yorkshire pudding or the Chantarelle with potatoes.
Whatever you choose, I am sure you will enjoy!