1. Roughly chop the nuts and either roast in the oven or in a dry frying pan on a medium heat until brown.
2. Over a saucepan of simmering water melt the chocolate and butter in a bowl. When completely mixed remove from the heat and add all the other ingredients. Mix well.
3. Pour into a lined baking tin and shake to level the mixture. Bake for around 35 mins at 170°C. The middle can and should be a little bit gooey.