I'm aware this is a bit of a strange question, but I wanted to get outside opinions before i jump in with two feet on this issue 
Over the last couple of weeks myself and DH have had my in-laws round for sunday lunch. Both times i cooked a beef and onion pie for the main course. I thought it would be a showstopper but for some reason both pies have smelled like wee and i was really confused as to why?
The first time it happened i presumed DH has bought a dodgy onion from the supermarket but when it happened the second time i knew that couldnt be the case as we had shopped for ingredients at a completely different, more upmarket, supermarket (under the impression that the onions were causing the wee smell). However, both times i used beef i had got from the same butcher. I can't help but think that, if it isnt the onions which are causing my pies to smell like wee, it must be the beef.
So basically, i was wondering should i confront the butcher? I dont want to upset or offend him, i just need him to know that the beef he sold me was unsavoury. What if myself, DH or even my in-laws had become ill after eating it? What if someone else has become ill from eating it?
i'm not sure if i should go back to his shop and tell him that the beef he sold me smells like wee when cooked or if i should leave a review on facebook so that others are aware of his dodgy meat and avoid the shop so they dont get ill, as the wee smell might be cause by bacteria?
i would really appreciate any advice you lovely people have! Thank you in advance 