Sift together low-gluten flour and baking powder, place grease paper on the bottom of the 7 inch heart-shaped mold.
Beat the eggs at a high speed, add the sugar 3 times and beat until thick, then switch to slow speed for 5 minutes until it becomes smooth.
The powder and milk that have been sieved are added accordingly 3 times ( Milk > egg > milk) and gently mixed well, then add corn oil and mix well again.
Next, divide the batter into 2 parts, add I part to material B and mix it until it melted, and the other part remains the original taste.
Steam the mold and pour ? of the original batter, steam for 5 minutes on a medium heat and pour ? coffee mixture on top and continue to steam for 5 minutes (continue this step until the coffee mixture is finished). And lastly steam for 15 minutes.