Instead of serving a Vegan guest some fake meat, pick any 'other-than-meat' items. Pizza or pasta with non-dairy cheese, ... of course if the person is a vegetarian instead of a vegan, it opens up lot more possibilities.
I would recommend calling the meat dept in the store
Call the meat department. They would be able to tell you exactly when they are available and answer any questions!
I honestly suggest calling the store, and if the person answering the phone doesnt know ask for the manager (not in a mean way but i think he knows the food delivery schedule)
I would think it would be around the holidays
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