Brownies

Directions

1. 1
   Pre-heat the oven to 180°C, 160°C fan, Gas mark 4. Lightly grease a 23 cm square cake tin and line with baking paper.
2. 2
   Sift the flour with the baking powder and cocoa. Put the chocolate into a heat proof bowl over a saucepan of hot water and leave until melted (alternatively, microwave on medium power, stirring occasionally, until just melted).
3. 3
   In a large bowl, whisk the eggs with the sugar and vanilla until slightly thickened. Then whisk in the chocolate mixture.
4. 4
   Fold in the flour mixture, mayonnaise and finely chopped walnuts, pour into the prepared tin and bake in a pre-heated oven for about 35-45 minutes. Then leave to cool in the tin before cutting into squares.
5. 5
   Challenge your friends to guess the secret ingredient - if you can bring yourself to give any of them away, that is.