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Line a baking tray with baking parchment. Melt the sugar in a medium frying pan over a medium heat for 4-5 mins until caramelised – it should be a dark amber colour. Don’t stir, as this causes the sugar to crystallise – instead, tilt the pan slowly so the sugar melts evenly.
Add the peanuts, stir with a wooden spoon, then quickly and carefully tip onto the prepared tray. Immediately sprinkle over the sea salt flakes and leave to cool until set. Will keep for several weeks in an airtight container.