Cut sponge fingers into half according to the shape of cup. (Reminder: Sponge finger is usually available at bakery supplies shops.)
For thick coffee syrup: Combine instant coffee powder, sugar and hot water, stir until dissolved. Add in plain water, mix well. Set aside to cool.
For egg custard: Combine egg yolks and sugar, whisk until thick. Add in evaporated milk, mix well. Bring 1/2 pot of water to boil, turn to medium heat, cook mixture over hot simmering water until thickened. Remove from heat, mix until smooth. Set aside to cool.
Whip dairy whipping cream until soft peak. (Reminder: Use stainless steel mixing bowl for whipping. Keep both mixing bowl and whisk in freezer for 30 minutes to chill them up before using.)
For cheese mixture: Combine mascarpone cheese and sugar, mix until smooth. Add in egg custard, mix until combined. Add in whipped cream, fold until combined. (Reminder: Mascarpone cheese is usually available at bakery supplies shops.)
Put a layer of cheese mixture at the bottom of the cup. Dip halved sponge fingers in coffee syrup, drain off excess syrup, then arrange on top of cheese mixture. Top with another layer of cheese mixture, followed by another layer of sponge fingers and one more layer of cheese mixture. Dust the top with cocoa powder, clean the sides of the cup with kitchen towel.
Keep refrigerated for 4-5 hours until completely chilled before serving.
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Notes
This recipe yields 21 cups (125 ml) of tiramisu. The nutritional value for reference is for 1 cup of tiramisu.