Meanwhile, place potatoes in a large pot with enough salted water to cover by 2 inches. Boil until tender, 15 minutes. Reserve ½ cup cooking water, then drain and return potatoes to pot. Cover to keep warm. Meanwhile, place bacon in a large, dry pan over medium-high heat. Cook, turning, until crispy, 4-6 minutes per side. Turn off heat; transfer to a paper-towel-lined plate.