If you have time, stud the lamb a day in advance to allow the flavours to really permeate the meat
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Roasted butternut squash
Heat oven to 190C/170C fan/gas 5. Peel 2 butternut squash, cut in half and scrape out the seeds. Dice the flesh into 5cm cubes. Place the squash in a large non-stick roasting tin. Drizzle over a little honey and sprinkle with 1 tbsp thyme leaves. Roast for 45 mins until it is turning golden and is tender all the way through. You can roast it with the lamb for the meat’s final 15 mins, then finish it off while the lamb rests.
Melty leeks in butter
Remove the outer skins of 6 trimmed leeks and cut into chunks about 5cm long. Wash in cold water, then briefly drain. Heat a large pan for a few mins, then first add the thicker leeks with a knob of butter. After 2 mins, add the rest of the leeks. Place a lid on the pan and cook for 4 mins more, occasionally giving them a stir. The water remaining on the leeks from washing should provide enough moisture to steam them. Serve with some flaked salt and a twist of pepper.