The following is the e-mail response from Yard House when asked which of their menu items are vegan:
Thank you very much for your inquiry. Although we do not have strictly vegan options available on our dining menu, we will gladly modify existing menu items to fit your diet criteria as best as we can. For example, our Portabella Burger can be made without the aioli or cheese and our Rice Bowls can be made without meat. There are endless possibilities and I encourage you to inquire with your server prior to ordering, as he/she can provide you a detailed listing of all ingredients within a particular dish so that you can modify accordingly.
We appreciate you writing in to us and look forward to seeing you soon!