I made this as birthday cake at work for another colleague - we've had three birthdays in three weeks! After making the fruity blueberry and coconut cake the previous week, I thought I'd go for something chocolaty this time, and this did not disappoint! I came across this recipe on BBC Good Food months ago, and so adapted this slightly to make this amazingly fudgy, pistachio topped brownie cake. It's a good one for making ahead as it'll keep for a few days and still be rich in the middle, and you could just as easily replace the pistachios with any other nut you fancy.
