Preheat the oven to 200°C/Gas Mark 6. Scatter the pistachio kernels on a baking tray and roast in the oven for about 5 minutes, until just starting to turn golden. Cool, then chop them roughly.
In a small pan over a medium heat, warm the cumin and coriander seeds until they begin to release their aroma. Transfer to a mortar and bash with the pestle until broken up, but not too fine. In the same pan, lightly toast the sesame seeds.
Add the roughly chopped nuts to the mortar, and bash until they are broken up into smallish pieces. Stir in the sesame seeds, mint if using, chilli flakes and salt and transfer to a serving bowl.
The dukka will keep for a couple of weeks in a screw-topped jar.
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