We took our friends who are visiting from St. Louis here for lunch on Friday, June 27. We placed our order with our waiter. Two of us ordered pizza with vegan cheese. After a considerable amount of time someone came to our table to inform us that the pizzas have butter and parmesan on the crust and asked if we would like to omit that. We said yes. Another lengthy amount of time went by and when the order arrived only one pizza had vegan cheese and the other had been prepared with regular cheese and the buttery, parmesan crust. The waiter told the woman who was helping him deliver our food that both pizzas were to be made vegan. They told me they would make another one right away. We waited...and waited...and waited. The pizza finally came out and everyone else was finished with their food. The waiter apologized and said the cost of that pizza would be removed from the bill. We were there for almost 2 hours which was not our intention as we had plans following lunch. It was frustrating and aggravating. The menu proudly advertises that pizzas can be made vegan. This vegan will not be returning. I want to count on my food order being properly prepared when I dine out. Mellow Mushroom needs to pay attention to dietary accommodations, especially since they make special note of doing so on their menu.