01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a large bowl, toss cauliflower florets with olive oil, sea salt, and black pepper until evenly coated.
03 - Arrange cauliflower in a single layer on the prepared baking sheet. Roast for 25 to 30 minutes, flipping halfway, until golden and tender.
04 - Whisk tahini, lemon juice, olive oil, minced garlic, cumin, and sea salt in a small bowl. Gradually add water, one tablespoon at a time, until sauce reaches a smooth, pourable consistency.
05 - Transfer roasted cauliflower to a platter and drizzle generously with lemon tahini sauce.
06 - Sprinkle with chopped parsley and toasted sesame seeds. Add lemon wedges if desired. Serve warm or at room temperature.