01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper.
02 - Toss cauliflower florets with olive oil, turmeric, cumin, coriander, cayenne if using, salt, and pepper until evenly coated.
03 - Spread cauliflower in a single layer on the prepared baking sheet.
04 - Roast for 25–30 minutes, turning once halfway, until golden and tender with crispy edges.
05 - Remove from oven and drizzle with lemon juice.
06 - Transfer to a serving platter and garnish with chopped cilantro. Serve hot.