Serve this at room temperature. Two hours before serving, remove from the refrigerator.
Place the potato in a small saucepan; cover with cold water. Place over high heat; bring to boil. Reduce heat to medium, and simmer until tender, 8 to 10 minutes. Drain, and mash very well with a fork; set aside.
Combine remaining ingredients in the bowl of a food processor, and pulse briefly until mixture is coarsely pureed. Transfer mixture to a medium bowl; whisk in reserved potato until well combined. Season with salt and pepper, cover, and transfer to the refrigerator.