Preheat oven to 200C and line a baking tray with baking paper.
Slice the cabbage into 1″ slices — as much as will fit on your baking tray.
Brush/rub with olive oil on both sides.
Peal the garlic and smash; rub garlic over the cabbage on both sides.
Crack fresh pepper and fresh sea salt on both sides.
Roast in the oven 20 minutes, and then flip, and roast a further 15. (Adjust cooking times as necessary so as to minimize the amount of over-browning.)