The customer posted an image on Hog's Breath Aspley Facebook page, where it was "liked" more than 2000 times.

Hog's Breath Cafe Australian general manager Ross Worth said the company had been in contact with the woman and apologised.

He said food hygiene was a top priority for the company and they had notified local health authorities about the incident.

Mr Worth said the plug had come from a sanitised ice food bath that was designated for fresh produce such as  lettuce and tomatoes to be washed in.

"On that day the staff members have pulled fresh produce out of the bath and accidently pulled the plug with it," he said.

"The business owner has re-trained his staff on the right processes to make sure this doesn't ever happen again."

Mr Worth said plugs would be chained to the ice baths to prevent them from being dislodged.

The customer, who has since removed her post from Facebook, also claimed kitchen staff  "thought it was funny" when they were told of the errant plug.

"I can't comment if they were laughing - I would guess not," Mr Worth said.

"It's not a laughing matter, and I'd like to think they wouldn't laugh."