Tenko Mori Ramen House located at Regent Place, Sydney.
It was extremely popular when I turned up for an early lunch on a Sunday. But the line doesn't take long to get through and there were plenty of seats (unless you had multiple people).
I decided to try the Pork and Kimichi Tonkotsu Ramen. While it was tasty, cheap and filling it wasn't all that special and you can find better Ramen in Sydney.