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Heat oven to 180C/160C fan/gas 4. Spread the nuts on a baking tray and roast for 15 mins. Tip the hot nuts into a bowl and toss with the butter, salt and paprika to taste, until coated. Tip the nuts back onto the tray and roast for 2 mins more to dry the coating onto them. Cool and store in an airtight container. The nuts will keep for 3 days.