Mix dry ingredients together, until well blended. Beat egg in the measuring cup you used, then add milk and mix until well incorporated. Take wet ingredients and mix into the dry, stirring until well combined. Pour batter into a heat proof ceramic bowl (the picture is of the actual bowl my mum uses) The bowl needs to hold a little over 2 cups. Cover mixture in the bowl with aluminum foil and place in a large pot. Put water around the bowl fill about 1/2 way up the bowl. Cover and steam for approx 2 hours. Check water level constantly and add more as needed to keep it at the original amount.