I just found out my vegan, Dairy Free, and Gluten free sister-in-law will be coming over for a barbecue this weekend with the rest of the family. I have no idea what to do for her on the grill but I don't want to leave her out. If anyone has any ideas or experience in this are I could really use the help. The only thing that comes to mind is portobello mushroom after that I'm done.