Sing Lum Khui Sour & Spicy Rice Noodle Restaurant is a Chinese Yunnan rice noodle shop in Tsim Sha Tsui where you choose your own toppings. You adjust the spice and sourness separately for the soup or the mixed noodles, and add toppings such as beef brisket, fu zhu, and fried tofu skin. The broth is heavier than Vietnamese pho and strongly sour, which divides diners. On a Friday at 4 p.m. there was no wait, but at busy times the wait runs about 25 minutes.