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Preheat oven to 240/460F on fan bake.
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Scatter cauliflower florets on a baking tray. Drizzle over olive oil and season with 1/2 tsp sea salt and 1/2 tsp cracked black pepper. Toss to coat the cauliflower then arrange in a single layer on the baking tray. If you need to use 2 baking trays to ensure they are in a single layer then do this.
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Bake cauliflower for 20-25 min or until it is tender and browning. Ensure that you toss the cauliflower and rotate it once during cooking.
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While the cauliflower is cooking, make the tahini dressing. In a small bowl combine tahini, water, lemon juice and garlic. Season with 1/2 tsp sea salt and 1/2 tsp cracked black pepper.
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Remove cauliflower from oven, drizzle or toss with dressing, scatter over parsley and/or coriander (cilantro) and nigella seeds and serve.