Wash and cut the cauliflower florets into bite-sized pieces and place them on a large sheet pan in a single layer. Toss with olive oil salt and pepper.
Bake at 400° F (204° C) for 15 minutes, then flip the cauliflower with a spatula and bake again for 10-15 more minutes until the cauliflower is soft and slightly brown at the edges.
While the cauliflower is baking, make the spicy tahini sauce by whisking together the tahini, Bragg's Liquid Aminos, and lemon juice until smooth. (This will become very thick.)
Add the water 1 tablespoon at a time until the desired consistency is achieved, then add the minced garlic and garlic chili sauce and whisk until well combined.
Drizzle the rainbow cauliflower with the spicy tahini sauce and balsamic glaze, then sprinkle with pomegranate seeds if desired.
Notes
Watch the cauliflower carefully at the end of roasting so that it doesn't burn. To keep the beautiful color of the rainbow cauliflower, don't let it get overdone.