1. Wash and cut the potatoes in half and place them in a baking dish with onion. Sprinkle them with oil, vinegar and salt.
2. Bake the potatoes in the middle of the oven for about 30 min. at 425°F. Let them cool slightly, and then add the Double Crème Blue cheese.
3. Cover with lots of fresh watercress and serve with the red onion.
Try also adding 100 g fresh arugula and a handful of roasted pumpkin seeds to the potatoes. Serve on their own or as side dish with salmon or beef.