Indian restaurant Kalpakavadi, in Fossgate, received the one out of five score - meaning major improvement necessary - following an inspection by City of York Council on March 10.
Inspectors said the cleanliness and condition of the facilities and building were "generally satisfactory", but they found "improvement necessary" in hygienic food handling.
However, the restaurant's management of food safety was rated as "major improvement necessary".
Owner Saji Kurian has spoken to The Press to explain what happened.
"It was really packed that day, it was Mother's Day and we were full," said Mr Kurian.
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