I like Laksa at IPOH in Sydney CBD and have always paid the 100% price of $10 for it. This is a pretty good deal if you are into Malaysian food. For $1 extra you also get a drink which is a good plus. Halal.
Not sure when this deal ends, cant seem to see it stated on the site.
Edit: Valid for 90 days from purchase, thanks eyew
Edit: Voucher only valid between 10:30-4:30, thanks bakalien