1. Place potatoes in a large saucepan; cover with water. Bring to a boil. Reduce heat, and simmer 14 minutes. Add garlic to pan; cook 1 minute. Drain potato mixture in a colander over a bowl, reserving 1/2 cup cooking liquid. Place potato mixture and reserved liquid in a food processor; add oil, juice, and salt. Pulse until smooth. Cover and chill overnight. Sprinkle with chives before serving.