For Sponge Cake, combine milk and butter and microwave until the butter is melted.
In a bowl add the mixture with egg and flour stir until well combined.
On another bowl beat egg white and sugar until stiff peak.
Take small amount of the meringue and combine with the flour paste until it is well combine.
Mix with the remaining meringue and add 1 packet of Kluang Coffee Kopi O.
Fold it in until well combined. Do not fold to much!
Divide into 3 equal volume and bake at 180c oven for 15-20 minutes or until toothpick came out clean.