Beat with mixer margarine and sugar. One by one add the eggs, beating gently. Add cocoa, previously melted in a water bath chocolate and baking powder. Coffee shake with 2 tbsp water, pour in the same court and beat again. Finally, add the peeled peanuts and stir gently. Divide the mixture of 2 parts that pour in two forms oblong cake (rectangular trays) previously greased and floured or lined with baking paper. Bake about 25 minutes in an oven preheated to 180C. The finished cake is allowed to cool for 10 minutes. Each cut into 12 squares and leave to cool completely. Serve cold.