1: Preheat the oven to 180°C (360°F). Toast 200 g pecan nuts: spread them out on a baking sheet and put in the oven for 5 minutes. Set aside, and leave the oven on.
If you don't have pecan nuts, walnuts will work just fine. For an extra-delicious brownie, you can caramelize the pecan nuts (Jeremy's idea). For a brownie with a more 'cereal' texture, add 50g rolled oats to the mixture. If possible, toast these like the nuts.