Potato Salad, Caribbean

Ingredients

• 1-1/2 pounds sweet potatoes, peeled, cut into 1" to 1-1/2" pieces
• 1-1/2 pounds russet potatoes, peeled, cut into 1" to 1-1/2" pieces
• 3/4 cup fat-free mayonnaise
• 1/2 cup fat-free milk
• 2 teaspoons lime juice
• 1 teaspoon cumin, ground
• 1/8 teaspoon cayenne pepper
• Salt, to taste
• 2 green onions and tops, sliced
• 1/4 cup small pimento-stuffed olives