That has been exactly my experience:The server came back and said that onions were ok as long as they weren't obvious on the plate. Pretty funny moment actually.
"I'm allergic to onions."
"Are you allergic or do you just not like them?"
"Oh, I'm allergic. It's something in the enzymes."
"So, no onion...no onion powder...no onion salt...?"
"Well, I can eat them if I have to, they just need to be chopped up fine, so I can't see them."
Butthead.
