Combine castor sugar, evaporated milk, vanilla extract and butter in a saucepan. Stir over low heat until sugar is dissolved and butter is melted. Once all ingredients are melted, turn off the heat and leave it on the stove to cool.
In a bowl, sift the flour, cocoa powder, baking powder and baking soda.
Once the liquid mixture is cooled, add the beaten eggs in and mix thoroughly. Finally, pour the mixture into the flour and stir till well combined. The final batter should be runny.
Pour the batter into prepared pan and place it in the steamer. Cover the top of the pan loosely with a sheet of aluminium foil.
Steam over medium heat for 45 mins or until a knife inserted comes out clean.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.