Preheat the oven to 190°C.
Peel, then cut the beets into wedges or half (depending on their size). Lightly crush the garlic cloves (with their skin on).c Arrange them in a baking tray.
Mix the balsamic vinegar with the olive oil and honey, then season the dressing with salt and pepper. Pour over the beetroot and garlic, add the oregano, and toss well.
Cover the dish with foil (or a lid), then bake for about 35-45 minutes, depending on the size of the beetroot. Serve warm as a side dish, or let it cool and use it for salads.