Preheat oven at 180 C.

Sift together flour and baking powder.

Separate the eggs into whites and yolks.

Beat whites till frothy.

Beat in sugar.

Add in yolks and oil and lighly beat.

Fold in flour and essence.

Pour the batter in a greased square pan.

Bake for 30 minutes or till it is done.

Leave the cake to rest for 10 minutes on kitchen counter.

Prick the cake to make deep holes with the handle of wooden spoon.

Cook together water and sugar till sugar dissolves and water boils.

Turn off the flame.

Mix in butter and cocoa.

Pour the sauce over the cake.

Leave it for 10 minutes.

Cut into slices.

Serve with tea/coffee.