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Preheat the oven to 425F (220C)
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Place the cauliflower florets onto a large baking sheet. Add the carrots. Drizzle the melted butter over them all and toss well to coat.
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Roast for 20-30 minutes, turning half way through, till veggies are tender.
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Remove 1/2 cup (125 ml) florets and cut into slightly smaller pieces to use as garnish. Set aside.
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Meanwhile, place the onion, garlic, thyme, and bay leaf into a large saucepan. Cover with about 1 cup (250 ml) of the broth.
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Simmer gently for 5 minutes until the onion is tender. Add the roasted cauliflower and carrot, remaining broth and dijon mustard.
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Simmer gently for 7-10 minutes, until the vegetables are very tender.
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Discard the bay leaf. Stir in the milk. Cool soup slightly.
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Purée in batches until smooth.
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Return to the saucepan and season with pepper and salt if needed.
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Serve:
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Fill soup bowls, and garnish with the reserved florets, a sprinkling of the dill and sumac or lemon zest.