Add the water, cornstarch, all purpose flour, eggs, coconut milk, pandan paste and salt into the bowl. Using a whisk, combine until smooth, then add in the chopped palm sugar. Keep mixing quickly, scraping down the sides as you go to avoid the custard clumping. In around 5-10 minutes, the mixture should start to thicken to more of a custard. Remove from the heat at this point while still a little runny.
Pinch salt, 75 ml water, 3 tbsp cornstarch / cornflour, 1.5 tbsp plain flour / all purpose flour, 2 eggs, 100 ml coconut milk, 1/2 tsp pandan flavouring, 80 g palm sugar, Pinch salt