One day I tried to make brownies for the hotel I used to work at. I asked a colleague to buy me pecans at the supermarket, but she couldn't find pecans, so I asked she just get me any kind of nut...then she bought me a packet of pistachios. In China we call pistachios "happy nuts". Normally chefs use pecans or other nuts for the brownies, but you must try the pistachio nuts, they taste great!
If you didn't buy your pistachios roasted, you can roast them in the preheated oven for 6 to 7 minutes on a dry baking tray - just watch carefully as they're quick to burn!