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Preheat an oven to 200°C fan/220°C/gas mark 7. Toast the cumin seeds in a dry frying pan over a medium heat for a minute or 2 until fragrant, then set aside. Toast the coriander seeds, fenugreek seeds and black mustard seeds in the same pan until fragrant, then transfer to a spice grinder or pestle and mortar. Add half the cumin seeds to the spice mix and blitz or grind to a powder. Stir the salt into the spice mix and set aside