Preheat the oven to 200°C/gas Mark 6.
Place the cauliflower and leaves, spaced apart, on a roasting tray (you may need two).
In a bowl, mix the oil, garlic, miso paste, tahini paste, rice vinegar and some seasoning, then use a pastry brush to generously coat the cauliflower until evenly covered.
Drizzle generously with some extra oil.
Roast for 20 minutes, or until the cauliflower is tender, golden and the leaves are crisp.
Remove from the oven and allow to cool slightly.
Before serving, sprinkle over.