Went to Kok Sen for lunch, luckily the queue wasn't too long given Christmas period. Ordered the smallest Prawn Hor Fun for $16 (enough for two small eaters) given all the raves on burpple and instagram. We also ordered a small portion of har cheong kai (prawn paste chicken) and fish noodle soup. The Hor Fun is a pretty unique dish with fragrant super rich prawn gravy, generous amounts of large prawns and bright crunchy greens. You can taste the wok hei in the noodles too. Only criticism is the prawns are slightly overcooked and a little powdery. It's quite a rich dish on its own so you may need to order other lighter dishes to balance out the meal. The har cheong kai was pretty average (won't order next time) but the fish noodles were yum too!! 8/10 overall. Will return.