Heat the oven to 180C/160C fan/gas 4. Butter a 20cm square tin and line with baking parchment. Melt the chocolate in a heatproof bowl set over a pan of simmering water, ensuring the bowl doesn’t touch the water. Remove from the heat and leave to cool slightly. Or, do this in 20-second bursts in the microwave.

Mix the flour and baking powder together in a medium bowl, then stir in the walnuts, dried fruit and a pinch of salt. Beat the butter and brown sugar together in a separate bowl until light and fluffy using an electric whisk. Beat in the eggs, one at a time, adding 1 tbsp of the flour mix with each addition to stop the wet ingredients from curdling.

Beat the cooled melted chocolate into the wet ingredients until fully incorporated. Mix in the tahini, then gently fold in all of the flour mixture, being careful not to knock out the air.

Tip the batter into the tin, level with a spatula and bake for 30-35 mins, or until set with a definite wobble in the middle. Leave to cool for 20 mins in the tin. Lift out of the tin onto a wire rack using the parchment to help and leave to cool completely (the brownie will firm up as it cools). Cut into 12 squares and serve with ice cream, if you like. Will keep in an airtight container for three days.