Bring potatoes, 1 teaspoon salt, and water to cover to a boil in a Dutch oven; cook 30 minutes or until potatoes are tender. Drain; cool slightly, and peel. Cut into cubes.
Combine potatoes, roasted peppers, green onions, and cilantro in a large bowl. Stir together lime juice and next 3 ingredients; pour over potato mixture, tossing gently to coat. Cover and chill until ready to serve.