To a small bowl, add in all ingredients for the turmeric marinade and mix until well combined.
Clean a whole cauliflower and trim off excess leaves and place onto a baking sheet.
Pour the marinade on top of the cauliflower and use a brush or your hands to coat the whole cauliflower in the marinade.
Bake for 1 hour.
Make the Green Tahini Sauve
While the cauliflower roasts, place all green tahini ingredients into a small blender or a food processor (except for za'atar and caraway seeds) and blend until smooth.
Then add in za'atar and caraway seeds and mix until well combined.
When the cauliflower is done cooking, pour the green tahini sauce over the cauliflower.