The spicy sour you can try this. One of the available Fu Zhou (福州) dishes in Kuantan. Otherwise you got to drive far away from Kuantan, i.e. Sri Jaya, about 50km from Kuantan. The taste of this dish with spicy sour will make your appetite greatly.
Full address is as below,
Restaurant Hock Hin
814, Jalan Penjara, Taman Raya, 25100 Kuantan, Pahang.