Are you using CarolineJ's tweak here Kerryn? I haven't done it myself but when she says adds 1/2 can to the steaming water, I imagine she means from a 400ml can so go with 200mls with 4 tspn fish sauce, 1 tspn brown or palm sugar and 4 tspns cornflour 90o/speed 4/ for 4 mins.