Mixed melted butter and powdered sugar and beat it till blended completely. Then put 2-3 eggs one at a time and beat continuously. Added vanilla essence and baking powder dissolved in luke warm water with a pinch of salt. Mixed till the mixture was smooth. Added 3 cups of flour and blended it in the mixture. Added walnuts and black currant in the mixture. Poured the mixture in the cake mould. Topped it with few more Blackcurrant berries. Preheated the oven at 170 C and baked till the needle comes out clean.