The incident happenedÂ at the Co-op supermarket on the High Street, Eynsham, Oxfordshire at around 12.40pm on Sunday, October 21.Â
The victim, a 74-year-old woman, was standing in line when the offender pushed in front of her in the queue.
She told the man that people were queuing and the offender threw a tub of butter at her.Â
The victim sufferedÂ swelling and severe bruising to her lip, however she did not require hospital treatment.
Police have released a CCTV image of a manÂ officers would like to speak to as part of their investigation.Â
Investigating officer PC Sarah Tibble based at Witney police station said: '˜I would like to speak to anyone who recognises the man in this image as he might have vital information relating to this incident.
'˜If you know this man, or have any information as to his whereabouts, please call the Thames Valley Police non-emergency number on 101.'
If you do not want to speak to police, please call the independent charity Crimestoppers on 0800 555 111.