Received an email as a Cotton On Perks member with the subject line "Don't miss out! Free Grill'd burger inside." Become a Relish Member and get a free Burger. Sign up via the link in email and get a voucher to redeem at any Grill'd store in QLD or WA. Order must be placed in restaurant (not online, at-table ordering, or delivery) and Relish promotional barcode scanned for offer to apply.
Get one of Simply Grill'd, Simon Says, Garden Goodness, Superpower Salad, or HFC Natural Bites (6 Bites).
My free Burger email came 5min after signing up.
Information on Grill'd Relish Membership