Burger Fuel offers a free Smash Browns with a purchase of any burger (except smaller bun burgers (4)).
Take the above voucher in to any BurgerFuel in New Zealand (or show it on the ol' smartphone) to get your fix.
From the menu, it looks like it excludes:
- Hamburgini with Cheese
- Bambina
- Chook Royale
- Combustion Tofu
Via GPForums
Gourmet burger only - fine print.