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Preheat the oven to 400°F (200°C / Gas Mark 6) and place the rack in the middle position.
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Arrange the cauliflower, sweet potatoes, and onion slices on a large sheet pan in an even layer. Drizzle 2 TB (30 ml) extra virgin olive oil, the Kosher salt, and ground curry (if using) over the vegetables and toss until the vegetables are evenly coated. Place the vegetables in the oven and roast until just tender, about 30 minutes. After 20 minutes, check for doneness by piercing the cauliflower and sweet potatoes to see if they are tender. Continue to roast the vegetables, checking every 10 minutes as needed. You want the vegetables to be just cooked through and not too soft.
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Meanwhile, heat a 5 qt (4.75 L) Dutch oven over medium high heat then add the remaining 2 TB (30 ml) extra virgin olive oil and heat until it shimmers. Add the minced onions and cook until soft and slightly browned, about 10 minutes. While cooking, stir every now and then so the onions don't stick to the pan.
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Add the minced garlic and minced ginger to the cooked onions and cook until fragrant, about 1 minute. Add the Swiss chard stem pieces and stir to coat and cook for a minute.
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Add the ground coriander, turmeric, cumin, cayenne, and cinnamon stick to the pan and stir to mix. Gently toast the spices for one minute.
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Add the tomato paste and cook for one minute. Then add the wine and deglaze the pan. Cook until the wine mostly evaporates.
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Add the coconut milk and vegetable stock and stir until the coconut cream and water is mixed together.
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Add the carrots, Swiss chard, and tomatoes and cook until the vegetables are tender, about 20 minutes. Stir the pot every now and then to keep the coconut milk from separating. Control the heat and keep the sauce at a simmer and not a brisk boil. This will keep the coconut milk from curdling.
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Once the roasted vegetables and the vegetables in the curry sauce are done, add the roasted vegetables, chickpeas, and raisins to the pot with the carrots, tomatoes, and Swiss Chard. Stir to combine. Cook for 5 minutes to warm up the chickpeas.
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Turn off heat, and add the lime zest, lime juice, and chopped cilantro.
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Garnish with chopped cashews and chopped cilantro. Serve with white or brown rice.