You can make this recipe ahead and refrigerate for up to 1 day; add the arugula right before serving.
1?1/2 lb. russet potatoes, peeled
Salt and pepper
1?3 cup extra-virgin olive oil
1?4 cup red wine vinegar
2 tsp. orange zest
1 cup roasted red peppers, sliced thin
1?2 cup Cerignola or manzanilla olives, pitted and halved
1?4 cup Kalamata olives, pitted
5 pepperoncini, sliced thin
2 cups baby arugula