Steamed version: Bring the water of steamer to the boil.
Baked version: Preheat oven to 200°C/395°F.
*Pandan juice: Blend 10 g of pandan leaves with 65 g of water. Extract 60 g of pandan juice, combine with melted butter.
Beat eggs lightly, add in salt and sugar, beat until combined. (Reminder: The net weight for 3 grade B eggs is about 160 g.)
Combine 1 Liter of plain water with 400 ml of hot water (from electric thermo pot) in a large steel bowl to yield warm water with temperature about 45°C/113°F.
Dip mixing bowl in warm water bath, beat egg mixture over medium-high speed for 5 minutes until stiff.
Combine plain flour and cornstarch, sift twice.
Add flour and butter pandan juice alternatively into egg mixture in 3 batches, fold gently with spatula until well mixed.
Transfer batter to measuring cup, then pour equally into 10 lined baking cups (7.5-cm).
Steamed version: Arrange baking cups in steamer racks, steam over medium heat for 8-9 minutes.
Baked version: Arrange on wire rack, bake in the preheated oven at 200°C/395°F for 25 minutes, or until golden brown. (Reminder: Different oven functions differently, baking time is just for reference, you may adjust the baking time if necessary.)
Unmould the pandan cupcakes and cool on wire rack.