1 large russet potato, peeled and quartered
1 large sweet potato, peeled and quartered
1 cup corn
1 teaspoon prepared Dijon-style mustard
2 tablespoons fresh lime juice
3 tablespoons chopped fresh cilantro
1 clove garlic, minced
3 tablespoons canola oil
1/2 teaspoon salt
1/4 teaspoon ground black pepper
1 cucumber, halved lengthwise and chopped
1/2 red onion, thinly sliced
1/4 cup finely chopped peanuts