How many would you like? http://www.flyeauclaire.com/how-long-is-stendra-effective who makes stendra Sift the flour, cocoa and bicarb into a bowl and set aside. Put the butter and sugar in a mixing bowl and beat until pale and increased in volume. Stir in the remaining ingredients – the black paste will turn the dough momentarily grey but don’t worry – then form into a ball and refrigerate until firm (30 minutes).