Prep the oven: Preheat oven to 425°F (220°C).
Season the veggies: Place cauliflower florets and chickpeas on a baking sheet. Drizzle with olive oil and sprinkle with cumin, paprika, coriander, turmeric, salt, and black pepper. Toss well.
Roast: Bake for 25–30 minutes, turning once halfway, until the cauliflower is golden and the chickpeas are crispy.
Make the dressing: In a small bowl, whisk tahini, lemon juice, olive oil, and garlic. Add water gradually until smooth and pourable. Season with salt.
Assemble: Place roasted cauliflower and chickpeas in a bowl or on a platter. Drizzle with tahini dressing. Add parsley, pomegranate seeds, and nuts if using.
Serve: Enjoy warm or at room temperature.