Place potato in a large saucepan and cover with cold water. Bring to the boil, covered, over high heat. Reduce heat to medium and simmer, uncovered, for 6 minutes or until potato is just tender. Drain. Transfer to a large bowl.
Meanwhile, heat 1 tablespoon oil in a large frying pan over medium heat. Add onion and bacon. Cook, stirring, for 5 minutes or until onion is soft. Stir in sugar and rosemary. Cook, stirring occasionally, for 5 to 8 minutes or until onion is caramelised.
Remove pan from heat. Stir in vinegar, remaining 1/4 cup oil and salt and pepper. Pour over potato. Sprinkle with chives. Toss gently until well combined. Serve.
Serving size: 8
Recipe courtesy of taste.com.au