1.
Preheat the oven to 200 degrees Celsius fan/220 degrees Celsius/425 degrees Fahrenheit/Gas 7.
2.
Peel and cut the sweet potatoes into irregular wedges and place on a baking sheet. Drizzle with olive oil, then season with salt, pepper and dried thyme. Bake in the preheated oven for 20–30 minutes until cooked through and slightly charred, then remove and set aside until the black bean stew is ready.
3.
For the minted yogurt dressing, crush the garlic clove and combine with the yogurt, mint, lemon juice, a generous pinch of salt and the cumin. Set aside.
4.
In a large pan, fry the onion in another splash of olive oil for five minutes until soft, then stir through the chilli and crushed garlic for a minute. Add the cumin, paprika and cinnamon, quickly followed by the tomatoes and black beans. Fill the used tomato can with cold water and pour into the pan, crumble in the stock cube and season with salt and pepper and a generous pinch of sugar. Part-cover the pan and simmer over a low heat for about 15 minutes or until the sauce has reduced and thickened. Fold the cooked sweet potatoes into the stew.
5.
Taste for seasoning, scatter the coriander over the top and add a swirl of the minted yogurt dressing, with the rest served on the side.
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