Put the potatoes in a large pot; add water just to cover and season with 1/4 teaspoon salt. Bring to a boil over medium-high heat and cook until tender, 8 to 10 minutes. Drain and cool slightly.

Meanwhile, cook the bacon in a large skillet until crisp. Drain on paper towels and finely chop.

In a large bowl, combine the potatoes, chopped bacon, bell pepper, onion and scallions.

In a small bowl, whisk the olive oil, vinegar, mustard, mayonnaise, 1/4 teaspoon salt and 1/4 teaspoon pepper. Pour over the potato mixture, tossing gently to coat. Cover and refrigerate or serve at room temperature.

Photograph by Kate Sears