Preheat oven to 180°C/160°C fan-forced. Place potatoes in a saucepan. Cover with cold water. Bring to the boil over high heat. Reduce heat to medium-low. Simmer for 8 to 10 minutes or until just tender. Drain.
Transfer potatoes to a baking dish. Sprinkle with onion. Drizzle with oil. Season with salt and pepper. Bake, turning halfway during cooking, for 30 to 40 minutes or until golden.
Sprinkle potatoes with tarragon. Drizzle with vinegar. Toss to combine. Serve.
Serving size: 8
Recipe courtesy of taste.com.au