Preheat your oven to 400 degrees. Cut the cauliflower into bite sized pieces. Add to a baking dish. Drizzle on your favorite cooking oil. Add kosher salt and black pepper to taste. Roast for 20-25 minutes until the cauliflower is browned and has soften without being mushy. Remove from oven.
To make the Tahini sauce, combine the Tahini with the honey and the water. Mix to combine. It should still be somewhat thick but pourable. Add salt to taste.
Pour the sauce over the cauliflower, top off with the parsley, and stir to mix. Serve hot.