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Step 1
Start by heating your oven to 450°F (230°C). While it’s warming up, poke a few holes in the sweet potatoes with a fork and pop them onto a baking sheet. Bake them for about 50 minutes to an hour, or until they’re nice and tender when you poke them with a fork.
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Step 2
While the sweet potatoes are cooking, warm up a large skillet over medium-high heat. Add the ground lamb and cook it, breaking it apart with a spoon, until it’s browned and crumbly—this usually takes around 5 to 7 minutes. Once it’s done, transfer the lamb to a plate and set it aside.
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Step 3
Next, toss the chopped onion, leek, and celery into the same skillet and sauté them until they’re soft and fragrant, about 4 to 5 minutes. Stir in the tomato sauce, chickpeas, cumin, salt, and pepper. Turn the heat down a bit and let everything simmer gently for 5 to 10 minutes. Then, add the lamb back in and cook it all together for another minute or two.
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Step 4
Turn your oven down to 325°F (165°C). Scoop the lamb mixture into a baking dish. Mash the sweet potatoes in a bowl, mixing in tahini and green onions until smooth and creamy. Spread this mash evenly over the lamb.
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Step 5
Pop the dish back into the oven and bake it for about 40 minutes, until it’s bubbling all over and the topping has a lovely golden color. Let it cool just a bit before serving, and enjoy!