Whipped Potatoes with Lima Bean Swirl

Purée the lima beans : In a medium saucepan, combine the frozen lima beans and water. Cook until water boils and beans are tender -- about 20 minutes. Let cool for 2 minutes. Do not drain. Place in a blender or food processor and purée until smooth. Add oil and pulse until evenly distributed. Keep warm and set aside.

Cook the potatoes : In a large saucepan over high heat, bring potatoes, 1/2 teaspoon salt, and enough water to cover potatoes to a boil. Cook the potatoes until just tender -- about 25 minutes. Drain and mash until all lumps are gone. Stir in the butter until completely melted. Stir in cream, remaining teaspoon salt, and white pepper. Swirl lima bean purée into mashed potatoes. Serve immediately.