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Heat oven to 200C/180C fan/gas 6. Slice the potatoes to about three-quarters of the way through at 1cm intervals. Brush with ½ tbsp of the olive oil, place on a baking tray and bake for 35-40 mins. Meanwhile, mix together the remaining oil, the chipotle, lime zest and juice.
Remove the potatoes from the oven and brush all over, and down into the slits, with the chipotle mixture. Return to the oven for another 15-20 mins or until cooked through. Scatter with the coriander leaves just before serving.