Moonee Ponds police are investigating after a woman attempted to pass a counterfeit note at North Essendon last week.
The incident happened at a fast-food restaurant on Keilor Road on 22 May at 6.15am.
Investigators have been told that the woman, driving a silver Honda CRV with false plates, ordered some food and attempted to pay with a $50 note.
Staff spoke to the woman after they realised that the note was counterfeit and she drove off, leaving the note and her food behind.
Investigators have released an image of a woman who they believe may be able to assist with their enquiries.
Anyone who recognises the woman is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au