Step 1

Preheat oven to 180 C/350 F. Lightly grease a 9 inch baking tin and place a piece of baking paper on the bottom.

Step 2

Break the chocolate into small pieces and place in a heat proof bowl along with the butter. Suspend the bowl over a pan of barely simmering water and leave to melt.

Step 3

Beat the eggs with a whisk in a large bowl until they are lemon coloured.

Step 4

Gradually add the sugars, beating continuously, until the mixture is thick (about 3 minutes).

Step 5

Stir in the melted chocolate mixture and the vanilla extract.

Step 6

Fold in the ground almonds and the chopped walnuts.

Step 7

Spoon the mixture into the prepared tin and bake for 35 minutes (for a really gooey brownie) or 40 minutes if you prefer a less gooey variety.

Step 8

Leave to cool completely in the tin before removing and cutting into squares.