Line a parchment paper on a tray, drop in 1 tbsp Nutella and make 3 numbers. Freeze for 10 mins.
Meanwhile in a bowl, mix the flour along with baking soda, cocoa powder, sugar, then add the melted butter and curds. Beat well.
Now slowly add hot water and combine to get a thick batter. Add more depending on the consistency.
The batter should be scoopable.
Grease Microwave safe ramekins with butter and fill to half of the bowls.
Place each frozen Nutella in the center of each bowl, cover with another spoon of batter.
Microwave for 30 secs in intervals, for 2 minutes till the cake is firm.
Total time should be around 1.5 minutes to 2 minutes, more than this the cake will become hard.
Turn over a serving plate and drizzle icing sugar over it.
The frozen Nutella melts during baking.