A candy thermometer is crucial for achieving the perfect brittle texture. Ensure accurate temperature readings. Superfine sugar melts more evenly, resulting in a smoother brittle. Humidity can affect the brittle's texture, so it's best to make this on a dry day. Avoid making brittle on rainy day. Roasting the pistachios beforehand intensifies their nutty flavor. Work quickly when incorporating the pistachios, baking soda, and cayenne, as the mixture will start to set rapidly.