Preheat the oven to 180°C.
If the beetroot is organic, just scrub the skin, only peel if it's not organic. Remove the ends, then cut the beets into wedges.
Put the beetroot wedges garlic cloves (unpeeled) in a small roasting dish. Scatter the thyme leaves on top and drizzle with the olive oil. Season with salt and pepper then toss together.
Cover the tin with foil and roast for 45 minutes, or until the beetroot are tender. Serve warm or cold with the whole garlic cloves (squeeze the flesh out of their skin).