Wow…is this something he normally orders (for me, that combo would definitely cause the problems he says he’s having), and are your ingredients exactly the same as usual (ie: same meat from same vendor (or way produced), etc.)?
I agree, call him, check on how he’s doing…express your sympathy without making it sound fake, and offer up either a free meal or a free gift card and assure him while he is the only one with a complaint, that you take it seriously, and can assure him that this is the first complaint you’ve ever had (and hopefully the last) and that you still wish to keep his business.
Sometimes, it just takes asking a customer what you can do to make it right that will get you and him “buddies” again…without jumping to the conclusion that he may be “out to get you” like many are right now, and without you having to break your bank, too.
I don’t know if this would be good business, but myself, I’d be curious to see if he went to the doctor, what type of food borne pathogen was found in the food, so you can isolate any problem, if there is one.
I know that on our end, it would be a good business move, but I just don’t know how you could ask a customer that without them feeling you don’t believe them.
ETA: Unless the others you ask are good friends of yours…I’m not so sure that I’d ask anyone else. If you really do have a problem, then they’ll come back to you. Otherwise, you may cause a panic with the rest of your customers…anyone agree?
Please keep us updated.
Kristi