01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Remove leaves and trim stem while keeping the head intact. Rinse and pat dry.
03 - Combine olive oil, ground cumin, smoked paprika, garlic powder, salt, and black pepper in a small bowl.
04 - Place cauliflower on prepared baking sheet and brush or rub seasoning all over for even coverage.
05 - Roast cauliflower for 45 to 55 minutes until golden and tender, piercing easily with a knife. Tent loosely with foil if browning too quickly.
06 - Whisk tahini, lemon juice, maple syrup, grated garlic, salt, and 3 tablespoons cold water together. Add additional water one tablespoon at a time to achieve a smooth, pourable consistency.
07 - Transfer roasted cauliflower to a serving platter. Generously drizzle with tahini lemon sauce.
08 - Sprinkle chopped parsley and toasted sesame seeds over cauliflower. Serve with lemon wedges if desired.