I went to 裕珍樓 several times, introduced by my Hong Kong friend. Dim sum is good, service also good and the plus point is LESS tourist.
潮州蒸粉果, HKD 12
香茜皮蛋魚片湯米, HKD 40
Address : Shop A, G/F, 4 Mongkok Road, Mong Kok (旺角,旺角道4號A地舖)
How to get there : MTR Mongkok station, exist A2. Walk 5 minutes. (港鐵旺角站 A2 出口, 步行約5分鐘)