There are plenty eateries around Central where you can spend HKD 40+- to enjoy a bite. Here goes:
No. 21 GOUGH STREET G/F, Kau Kee Restaurant. It’s famous for its beef brisket. Don't go during lunch as there will be a long queue.
No. 35 LYNDHURST TERRACE G/F, Tai Cheong Bakery. It's a Chinese bakery enough said.
No. 2 ELGIN STREET, Leaf Dessert. Chinese dessert.
No. 98 WELLINGTON STREET G/F, Tsim Chai Noodle.
No.2 MEE LUN STREET. It's call 勝香園 (sorry I don't think they have a English name). It's an open air restaurant, you will have to eat on the street (Don't worry they have tables and chairs).
No. 60 HOLLYWOOD ROAD G/F, Kung Lee, Chinese herbal drinks
I would suggest you go with a friend who can read and speak canto for the first time round.
