Place cauliflower onto a pan and drizzle with olive oil, salt, and pepper. Toss together until evenly coated and combined
Cut off the top part of an entire head of garlic (just so the majority of the clovers are barely exposed. Place in a piece of foil and drizzle with olive oil. Fold the foil tightly closed to form a ball with no garlic exposed or oil leaking. Place it on the sheet tray with the cauliflower
Roast the cauliflower and garlic for 20 minutes until the cauliflower are crispy and golden
Get a small bowl and mash 5 cloves of the roasted garlic with a fork. Add in Kewpie mayo (or regular mayo if you cannot find this), Calabrian chopped chili, salt, pepper, and lemon zest. Stir it until evenly combined (this can also be done in a food processor)
Serve roasted cauliflower alongside a side of the Calabrian chili mayo