Roasted Butternut Squash with Sweet Spices, Lime and Green Chilli

Preheat the oven to 210°C/Gas Mark 7. Trim off the limes’ tops and tails using a small sharp knife. Stand each lime on a chopping board and cut down the sides of the fruit, following its natural curves, to remove the skin and white pith. Quarter the limes from top to bottom, and cut each quarter into thin slices, 1-2 mm thick. Place them in a small bowl, sprinkle with a little salt, drizzle with 1 tablespoon of the olive oil, stir and set aside.

Next, cut the butternut in half lengthways, scoop out the seeds and discard. Cut each half, top to bottom, into 1cm thick slices and lay them out on a large baking sheet lined with greaseproof paper.

Place the cardamom pods in a mortar and work with a pestle to get the seeds out of the pods. Discard the pods and work the seeds to a rough powder. Transfer to a small bowl, add the allspice and the remaining 3 tablespoons of oil, stir well and brush this mixture over the butternut slices. Sprinkle over a little salt and place in the oven for 15 minutes or until tender when tested with the point of a knife. Remove from the oven and set aside to cool.

Meanwhile, whisk together the yoghurt, tahini, lime juice, 2 tablespoons of water and a pinch of salt. The sauce should be thick but runny enough to pour; add more water if necessary.

To serve, arrange the cooled butternut slices on a serving platter and drizzle with the yoghurt sauce. Spoon over the lime slices and their juices and scatter the chilli slices over the top. Garnish with the coriander and serve.