Police officers rushed to hospital after a suspicious substance was thrown through a car window were released when it was identified as HP sauce.
The Metropolitan Police said officers responded to reports of an "unusual smell" coming from a car with a smashed window in Enfield, north London.
They saw an unknown brown substance inside and those who came into contact with it were taken to hospital.
No arrests have been made over the incident in the early hours of Friday.
The spokesman said: "Officers who came into contact with the substance were taken to hospital as a precautionary measure.
"The substance was eventually identified as a harmless food substance."