Preheat the oven to 200 ° C. Fold a 1.5 m piece of aluminum foil in half across the middle. Place beetroot with garlic and herb leaves in the middle of the foil, season with plenty of salt and pepper. Bend the foil edges up, then drizzle the vinegar and oil over the beetroot. Close the foil carefully. Bake the package on a tray in the oven for about 1 hour.