Preheat the oven to 400F. Line a baking sheet with parchment paper.
Toss the cauliflower onto the parchment paper along with the olive oil and shawarma spice mix.
Mix well so that each piece is well coated in oil and spices. Roast for 40-45 minutes. (I used rather large florets. If you prefer smaller florets, you will have to adjust the cooking time)
While the cauliflower is roasting, whisk together the turmeric tahini dressing.
Remove the cauliflower from the oven and transfer to a serving platter.
Top with the sauce, pomegranate seeds, fresh chopped herbs, and sesame seeds.