Wash the potatoes thoroughly, but do not peel them. Then cut in half and place in a bowl. Pour in the oil, add a lot of salt and pepper and stir well.
Now place the potatoes with the cut surface facing down on the baking tray and pour the remaining oil over them. Sprinkle with a little salt if necessary. Now distribute the rosemary sprigs between the triplets, peel the garlic and place on the baking tray.
Place in the oven at 200 ° C for about 25 minutes (until the potatoes turn brown).