01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss cauliflower florets with 1 tablespoon olive oil, the white parts of the green onions, salt, and pepper. Spread evenly on the prepared baking sheet.
03 - Roast cauliflower for 25–30 minutes, turning once halfway, until golden and tender.
04 - While cauliflower roasts, prepare the sauce: In a small bowl, whisk together tahini, miso paste, olive oil, lemon juice, maple syrup or honey, minced garlic, and water until smooth. Add more water if needed to reach a pourable consistency.
05 - Transfer roasted cauliflower to a serving bowl. Drizzle with the miso-tahini sauce and toss gently to coat. Top with green parts of green onions and toasted sesame seeds. Serve warm or at room temperature.