thai traveling guides information about Sangkhaya Fakthong (Custard Pumpkin). thai traveling guides teaches cooking Custard pumpkin and Bua Loi Phuak (Taro Balls in Coconut Cream). thai traveling guides cut a slice off the top of the pumpkin, remove seeds and most of the soft pulp. In a mixing bowl, light whisk the eggs, add the sugar, salt and coconut cream and stir until well blended. Pour the mixture into the pumpkin and cook in steamer (for approximately 20 minutes) until the custard is set. Make 4 serving. Put the gluttinous-rice and flour and the corn flour in bowl.