Remove leaves and trim stem from cauliflower. Cut cauliflower into 8 wedges. Mix turmeric and pepper flakes. Brush wedges with oil; sprinkle with turmeric mixture., Grill, covered, over medium-high heat or broil 4 in. from heat until cauliflower is tender, 8-10 minutes on each side. If desired, drizzle with lemon juice and additional oil, and serve with pomegranate seeds.