Sichuan gets all the attention but Hunan cuisine is genuinely spicier and more interesting. There's this place called Xiang La Hui on Jaffe Road in Wan Chai that does proper Hunan dishes - the mao xie crab is insanely good and will destroy your mouth in the best way.

Order the fish head with chopped chilies if you really want to test your limits. About HK$200-300 for two people. No English menu but point at other tables - everything is good.