The combination of tahini, halva and chocolate is so good that some members of staff (Tara, we see you!) had to put a temporary ban on their eating of these particular brownies during the making of Simple. It is very hard to eat just the one. To achieve the perfect balance of cakey and gooey – that sweet spot that all brownies should hit – the cooking time is crucial. It will vary by a minute or so between different ovens, and depending on where the tray is sitting in the oven, so keep a close eye on them.