I would call them directly
My name is Michael I am the chef here at Macray banquets and events center. I can assure you that nothing comes out of a can there is no mushroom base or soup in your chicken Florentine . The sauce is made with chicken stock of which we make in house onions, fresh spinach and light chicken base no msg we reduce it and add heavy cream and reduce again. But thank you for your questions and please let me know if I can help
All you need to do is ask, I'm sure they would be pleased you enjoyed it that much
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