Instructions
Preheat the oven to gas mark 4.
Sift together the flour and baking powder. Add the egg yolks, sweetener, most of the coconut (keep some aside to decorate the cake), essence and water. Mix it altogether.
Whisk the egg whites until stiff and gently fold into the mixture.
Pour the mixture into a square 7/8 inch lined cake tin and bake for 30 minutes.
Once cooled, spread over the jam and sprinkle the remaining coconut.